J. T. O'Sullivan#NFL statistics

{{Short description|American gridiron football player (born 1979)}}

{{Use American English|date=February 2024}}

{{Use mdy dates|date=February 2024}}

{{good article}}

{{Infobox NFL biography

| name = J. T. O'Sullivan

| image = JT-OSullivan-8-16-08-Packers.jpg

| caption = O'Sullivan with the San Francisco 49ers in 2008

| number = 4, 7, 14, 0{{cite web | url=https://www.profootballarchives.com/players/o/osul00300.html | title=J.T. O'Sullivan | publisher=Pro Football Archives | accessdate=13 September 2024}}

| position = Quarterback

| birth_date = {{birth date and age|1979|08|25}}

| birth_place = Burbank, California, U.S.

| height_ft = 6

| height_in = 2

| weight_lbs = 232

| high_school = Jesuit {{nowrap|(Carmichael, California)}}

| college = UC Davis (1997–2001)

| draftyear = 2002

| draftround = 6

| draftpick = 186

| pastteams = * New Orleans Saints ({{NFL Year|2002}}–{{NFL Year|2004}})

| pastcoaching = * Patrick Henry High School (2019–2021)
Head coach

| highlights = * All-NFL Europa (2007)

  • NFL Europa Co-Offensive MVP (2007)
  • NFL Europa passing yards leader (2007)
  • NFL Europa passer rating leader (2007)
  • NFL Europa passer touchdowns co-leader (2007)
  • First-team All-American (2000)
  • Second-team All-American (2001)

| statlabel1 = Completions–attempts

| statvalue1 = 145–257

| statlabel2 = Completion percentage

| statvalue2 = 56.4

| statlabel3 = Passing yards

| statvalue3 = 1,866

| statlabel4 = TDINT

| statvalue4 = 9–13

| statlabel5 = Passer rating

| statvalue5 = 69.9

| pfr = O/OSulJ.00

}}

John Thomas O'Sullivan (born August 25, 1979) is an American former professional football player who was a quarterback for nine seasons in the National Football League (NFL), two seasons in NFL Europe and one season in the Canadian Football League (CFL). He played college football for the UC Davis Aggies of the University of California, Davis, where he was a three-year starter and threw for career totals of 10,745 yards and 96 touchdowns. He was named a first-team All-American in 2000 and a second-team All-American in 2001. He was inducted into the Cal Aggie Athletics Hall of Fame in 2008.

O'Sullivan was selected by the New Orleans Saints in the sixth round of the 2002 NFL draft. He also spent time with 10 other NFL teams: the Green Bay Packers, Chicago Bears, Minnesota Vikings, New England Patriots, Carolina Panthers, Detroit Lions, San Francisco 49ers, Cincinnati Bengals, San Diego Chargers, and Oakland Raiders. He was a backup for the majority of his NFL career but began the 2008 season as the starter for the 49ers. He also played for the Frankfurt Galaxy of NFL Europe in 2004 and 2007, leading the Galaxy to the World Bowl each year. He earned All-NFL Europa and NFL Europa Co-Offensive MVP honors in 2007. O'Sullivan spent the final season of his professional career as a backup for the Saskatchewan Roughriders of the CFL.

In 2018, he started the YouTube channel "The QB School", where he analyzes quarterbacks. He was the head football coach of Patrick Henry High School in San Diego from 2019 to 2021.

Early life

John Thomas O'Sullivan was born on August 25, 1979, in Burbank, California. He attended Jesuit High School in Carmichael, California, where he played football and baseball. In football, he was a two-time All-Metro League selection and led his school to a Sac-Joaquin Section crown in 1995.{{cite web|url=http://www.sfgate.com/sports/article/Traveling-man-O-Sullivan-hopes-to-settle-down-as-3196956.php |title=Traveling man O'Sullivan hopes to settle down as a 49er |work=SFGate |date=September 5, 2008 |access-date=September 18, 2016 |author=FitzGerald, Tom |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160919030100/http://www.sfgate.com/sports/article/Traveling-man-O-Sullivan-hopes-to-settle-down-as-3196956.php |archive-date=September 19, 2016 }}{{cite web|url=http://blogs.sacbee.com/preps/archives/2008/09/jesuit-a-qb-fac.html |title=Jesuit, a QB factory over the years, now braces for QB ace |work=The Sacramento Bee |date=September 11, 2008 |access-date=September 18, 2016 |url-status=bot: unknown |archive-url=https://archive.today/20160919025240/http://blogs.sacbee.com/preps/archives/2008/09/jesuit-a-qb-fac.html |archive-date=September 19, 2016 }} He was also team captain his senior year. O'Sullivan also set school records for single-season passing yards with 1,794 during his senior year and career passing yards with 3,500. In baseball, he played catcher and earned all-league honors. He had a .450 batting average his senior season. O'Sullivan graduated from Jesuit High School in 1997.{{cite web|url=http://www.jesuithighschool.org/announcement/congratulations-dan-carmazzi-new-position |title=Congratulations to Dan Carmazzi on New Position |publisher=Jesuit High School |date=April 25, 2012 |access-date=September 18, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160919024212/http://www.jesuithighschool.org/announcement/congratulations-dan-carmazzi-new-position |archive-date=September 19, 2016 }}

College career

O'Sullivan was a four-year letterman for the UC Davis Aggies, who competed in NCAA Division II at the time, of the University of California, Davis from 1998 to 2001. He was redshirted in 1997 and was a backup his redshirt freshman year in 1998. He was a starter his final three seasons.{{cite web|url=http://www.cstv.com/sports/m-footbl/stories/090706aaa.html |title=No. 19 UC Davis Readies For Challenge Against BCS Contender TCU |publisher=cstv.com |date=September 6, 2006 |access-date=September 9, 2016 |url-status=dead |archive-url=https://web.archive.org/web/20160910031019/http://www.cstv.com/sports/m-footbl/stories/090706aaa.html |archive-date=September 10, 2016 }}

As a sophomore in 1999, O'Sullivan completed 208 of 341 passes for 3,217 yards and 26 touchdowns with 16 interceptions. He was also named an Honorable Mention All-American by Don Hansen's Football Gazette and was voted most improved player by his teammates in 1999.{{cite web|url=http://grfx.cstv.com/photos/schools/ucda/genrel/auto_pdf/1999-00Recap.pdf |title=Year-End Report: 1999–2000 |publisher=grfx.cstv.com |access-date=September 9, 2016 |pages=2 |url-status=dead |archive-url=https://web.archive.org/web/20160909180404/http://grfx.cstv.com/photos/schools/ucda/genrel/auto_pdf/1999-00Recap.pdf |archive-date=September 9, 2016 }}

As a junior in 2000, he threw for 3,679 yards and a school single-season record 38 touchdowns passes as the Aggies advanced to the Division II semifinals, where they lost to Bloomsburg by a score of 58–48.{{cite web|url=http://www.ucdavisaggies.com/sports/m-footbl/Biggsmemories.html |title=20 Great Years, 20 Great Memories |publisher=University of California, Davis |access-date=September 8, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160908235845/http://www.ucdavisaggies.com/sports/m-footbl/Biggsmemories.html |archive-date=September 8, 2016 }}{{cite web | url=http://fs.ncaa.org/Docs/stats/football_champs_records/2012/d2/2012DIIfbchamp.pdf | title=Championship Results | publisher=NCAA | access-date=September 18, 2016 | archive-url=https://web.archive.org/web/20160304063426/http://fs.ncaa.org/Docs/stats/football_champs_records/2012/d2/2012DIIfbchamp.pdf | archive-date=March 4, 2016 | url-status=live }} O'Sullivan had a 193.85 passer rating and was the only Division II player to receive a Heisman Trophy vote that season.{{cite web|url=http://www.harlonhill.com/2001/jt_osullivan_west01.htm |title=J.T. O'SULLIVAN |publisher=Harlon Hill Trophy |access-date=September 8, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160909030458/http://www.harlonhill.com/2001/jt_osullivan_west01.htm |archive-date=September 9, 2016 }} He was named a third-team Little All-American by the Associated Press, a second-team All-American by both Don Hansen's Football Gazette and Daktronics, and a first-team All-American by D2Football.com{{cite news|url=https://www.mcall.com/2000/12/20/ap-little-all-american-team/ |title=AP-Little-All-American Team |work=The Morning Call |date=December 20, 2000 |access-date=September 8, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160909025749/http://articles.mcall.com/2000-12-20/sports/3327712_1_west-georgia-valdosta-state-delta-state |archive-date=September 9, 2016 }}{{cite news|url=http://www.pressregister.com/article_ca4be9de-7af1-5ed5-9844-f37f10737a5b.html |title=Delta State's Bell, Bonner named to All-American team |work=pressregister.com |date=December 19, 2000 |access-date=September 8, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160909025736/http://www.pressregister.com/article_ca4be9de-7af1-5ed5-9844-f37f10737a5b.html |archive-date=September 9, 2016 }}{{cite web|url=http://grfx.cstv.com/photos/schools/ucda/genrel/auto_pdf/2000-01Recap.pdf |title=Year-End Report: 2000–01 |publisher=grfx.cstv.com |access-date=September 9, 2016 |url-status=dead |archive-url=https://web.archive.org/web/20160910022513/http://grfx.cstv.com/photos/schools/ucda/genrel/auto_pdf/2000-01Recap.pdf |archive-date=September 10, 2016 }} He was also named first-team All-West Region by Daktronics. O'Sullivan was a finalist for the Harlon Hill Trophy and a team co-captain as well. He was co-winner of the Jerry Norris Award in 2000 as the team's most valuable and inspirational player.

As a senior in 2001, he completed 255 of 406 passes for 32 touchdowns and a school single-season record 3,826 yards as the Aggies advanced to the Division II semifinals, where they lost to North Dakota by a score of 14–2. O'Sullivan was named a second-team All-American by both D2Football.com and Daktronics, and an Honorable Mention All-American by Don Hansen's Football Gazette. For the second year in a row, he was both a finalist for the Harlon Hill Trophy and a team co-captain.{{cite web|url=http://grfx.cstv.com/photos/schools/ucda/genrel/auto_pdf/2001-02Recap.pdf |title=Year-End Report: 2001–02 |publisher=grfx.cstv.com |access-date=September 9, 2016 |url-status=dead |archive-url=https://web.archive.org/web/20160910024704/http://grfx.cstv.com/photos/schools/ucda/genrel/auto_pdf/2001-02Recap.pdf |archive-date=September 10, 2016 }} He was the first UC Davis player to twice be on the final ballot for the Harlon Hill Trophy. He also won the school's Colby E. "Babe" Slater Award for Male Athlete of Year in 2001. O'Sullivan played in the 2002 East–West Shrine Game.{{cite web|url=http://www.upi.com/Shrine-Game-West-21-East-13/49271010879121/ |title=Shrine Game: West 21, East 13 |publisher=United Press International |date=January 12, 2002 |access-date=September 18, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160919015114/http://www.upi.com/Shrine-Game-West-21-East-13/49271010879121/ |archive-date=September 19, 2016 }}{{cite web|url=http://www.sfgate.com/sports/article/QB-s-chance-to-shine-in-Shrine-2884495.php |title=QB's chance to shine in Shrine |work=SFGate |date=January 12, 2002 |access-date=September 18, 2016 |author=Dickey, Glenn |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160919015438/http://www.sfgate.com/sports/article/QB-s-chance-to-shine-in-Shrine-2884495.php |archive-date=September 19, 2016 }}

He completed 669 of 1,070 passes for 10,745 yards and 96 touchdowns with 41 interceptions during his college career. He also set the school record for total offense with 11,544 yards.{{cite web | url=https://issuu.com/ucdavisaggies/docs/2011fbmediaguide/84 | title=2011 UC Davis Football Media Guide | date=August 24, 2011 | publisher=University of California, Davis | access-date=September 8, 2016 | archive-url=https://web.archive.org/web/20160908181059/https://issuu.com/ucdavisaggies/docs/2011fbmediaguide/84 | archive-date=September 8, 2016 | url-status=live }}

O'Sullivan set a Division II record for touchdown passes in a playoff game with six, set on November 25, 2000, against Mesa State.{{cite web|url=http://cmumavericks.com/custompages/Football/Records/Team%20Records.pdf |title=Mesa State Mavericks Football Records |publisher=Colorado Mesa University |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160908012855/http://cmumavericks.com/custompages/Football/Records/Team%20Records.pdf |archive-date=September 8, 2016 }} He also set a Division II record for most consecutive games with a touchdown pass.{{cite news|url=http://www.seattlepi.com/sports/article/Small-Colleges-Western-finale-at-UC-Davis-has-a-1071243.php |title=Small Colleges: Western finale at UC Davis has a playoff tone |date=November 8, 2001 |access-date=September 9, 2016 |author=Kiggins, Steve |work=Seattle Post-Intelligencer |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160909195015/http://www.seattlepi.com/sports/article/Small-Colleges-Western-finale-at-UC-Davis-has-a-1071243.php |archive-date=September 9, 2016 }} He was Chapter President of the Phi Delta Theta chapter at UC Davis as well.{{cite web|url=http://www.phideltatheta.org/index.php?Itemid=9&id=375&option=com_content&task=view |title=Former Chapter President at UC-Davis Named NFL Starting Quarterback |publisher=Phi Delta Theta |access-date=September 9, 2016 |url-status=bot: unknown |archive-url=https://archive.today/20120910000010/http://www.phideltatheta.org/index.php?Itemid=9&id=375&option=com_content&task=view |archive-date=September 10, 2012 }} O'Sullivan graduated with a Bachelor of Arts in English.{{cite web|url=https://www.ucdavis.edu/news/6-aggie-alumni-shine-bright-awards-spotlight/ |title=6 Aggie alumni shine bright in awards spotlight |publisher=University of California, Davis |date=January 16, 2009 |access-date=September 19, 2016 |author=Parker, Clifton B. |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160920023636/https://www.ucdavis.edu/news/6-aggie-alumni-shine-bright-awards-spotlight/ |archive-date=September 20, 2016 }} He was inducted into the Cal Aggie Athletics Hall of Fame in 2008.{{cite web|url=https://www.ucdavis.edu/news/internal-medicine-honeybee-research-athletics |title=Internal medicine, honeybee research, athletics |publisher=University of California, Davis |date=April 17, 2008 |access-date=September 18, 2016 |author=Parker, Clifton B. |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160919012012/https://www.ucdavis.edu/news/internal-medicine-honeybee-research-athletics |archive-date=September 19, 2016 }}{{cite web|url=http://www.dailydemocrat.com/article/ZZ/20080602/NEWS/806029714 |title=O'Sullivan inducted in UCD Hall of Fame |work=Daily Democrat |date=June 2, 2008 |access-date=September 18, 2016 |author=Brown, Daniel |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160919013005/http://www.dailydemocrat.com/article/ZZ/20080602/NEWS/806029714 |archive-date=September 19, 2016 }} In 2009, he was the recipient of the school's Young Alumnus Award.

Professional career

O'Sullivan had a long career, predominantly in the NFL, as a journeyman quarterback.{{cite web|url=http://www.sandiegouniontribune.com/sdut-have-arm-will-travel-life-of-nfl-journeymen-2015nov20-story.html |title=Have arm, will travel: Life of NFL journeymen quarterbacks |work=The San Diego Union-Tribune |agency=Associated Press |date=November 20, 2015 |access-date=September 18, 2016 |author=Wawrow, John |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160919020452/http://www.sandiegouniontribune.com/sdut-have-arm-will-travel-life-of-nfl-journeymen-2015nov20-story.html |archive-date=September 19, 2016 }}

{{NFL predraft

| height ft = 6

| height in = 2

| weight = 223

| dash = 4.91

| ten split = 1.68

| twenty split = 2.83

| shuttle = 4.28

| cone drill = 7.46

| vertical = 29

| broad ft = 8

| broad in = 11

| wonderlic = 35 {{cite web|url=http://wonderlictestsample.com/nfl-wonderlic-scores/ |title=Historical NFL Wonderlic Scores |publisher=WonderlicTestSample.com |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160902201337/http://wonderlictestsample.com/nfl-wonderlic-scores/ |archive-date=September 2, 2016 }}

| note = All values from NFL Combine{{cite web | url=http://www.nfldraftscout.com/ratings/dsprofile.php?pyid=1352&draftyear=2002&genpos=QB | title=J.T. O'Sullivan | publisher=NFLDraftScout.com | access-date=September 6, 2016 | archive-url=https://web.archive.org/web/20160920161726/http://www.nfldraftscout.com/ratings/dsprofile.php?pyid=1352&draftyear=2002&genpos=QB | archive-date=September 20, 2016 | url-status=live }}

}}

=New Orleans Saints and Frankfurt Galaxy=

O'Sullivan was selected by the New Orleans Saints in the sixth round of the 2002 NFL draft with the 186th overall pick. He signed a three-year contract worth $973,000 with the Saints on July 25, 2002.{{cite web|url=http://www.neworleansprofootball.com/2002/07/mitchell-osullivan-monroe-agree-to.html |title=Mitchell, O'Sullivan, Monroe Agree to Three Year Deals |publisher=NewOrleansProFootball.com |date=July 25, 2002 |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921194036/http://www.neworleansprofootball.com/2002/07/mitchell-osullivan-monroe-agree-to.html |archive-date=September 21, 2016 }}{{cite web|url=http://www.foxsports.com/nfl/jt-osullivan-player-transactions |title=J.T. O'SULLIVAN |publisher=Fox Sports |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160917063351/http://www.foxsports.com/nfl/jt-osullivan-player-transactions |archive-date=September 17, 2016 }} The deal included a $68,000 signing bonus.{{cite web | url=http://a.espncdn.com/nfl/nfc/draftsignings2002.html | title=Signing status of NFC draft picks | publisher=ESPN | date=July 27, 2002 | access-date=September 6, 2016 | archive-url=https://web.archive.org/web/20170216065526/http://a.espncdn.com/nfl/nfc/draftsignings2002.html | archive-date=February 16, 2017 | url-status=live }} He was inactive as the third quarterback for all 16 regular season games in 2002.{{cite web | url=http://cfn.scout.com/a.z?s=451&p=9&c=2&cid=464234&nid=2751030&fhn=1&ssf=1&RequestedURL=http%3a%2f%2fcfn.scout.com%2fa.z%3fs%3d451%26p%3d9%26c%3d2%26cid%3d464234%26nid%3d2751030%26fhn%3d1 | title=QB J.T. O'Sullivan: Third QB Added | publisher=Scout.com | access-date=September 21, 2016 | archive-url=https://web.archive.org/web/20160922001721/http://cfn.scout.com/a.z?s=451&p=9&c=2&cid=464234&nid=2751030&fhn=1&ssf=1&RequestedURL=http%3a%2f%2fcfn.scout.com%2fa.z%3fs%3d451%26p%3d9%26c%3d2%26cid%3d464234%26nid%3d2751030%26fhn%3d1 | archive-date=September 22, 2016 | url-status=dead }} O'Sullivan was released by the Saints on September 16, 2003.{{cite web|url=https://www.espn.com/nfl/transactions/_/date/20030921 |title=NFL Transactions |publisher=ESPN |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907192711/http://www.espn.com/nfl/transactions/_/date/20030921 |archive-date=September 7, 2016 }} He re-signed with the Saints on September 21.{{cite web|url=http://www.deseretnews.com/article/515033472/Sports-transactions.html?pg=all |title=Sports transactions |work=Deseret News |date=September 22, 2003 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907192451/http://www.deseretnews.com/article/515033472/Sports-transactions.html?pg=all |archive-date=September 7, 2016 }} He was again inactive as the third quarterback for all 16 regular season games in 2003.

O'Sullivan was allocated to NFL Europe on January 27, 2004, where he played for the Frankfurt Galaxy during the 2004 season.{{cite web|url=http://sportsforecaster.com/nfl/player/5118/trans |title=J.T. O'Sullivan |publisher=SportsForecaster.com |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907192501/http://sportsforecaster.com/nfl/player/5118/trans |archive-date=September 7, 2016 }} He started eight games for the Galaxy in 2004, completing 120 of 196 passes for 1,527 yards, ten touchdowns and five interceptions with a record of 6–2 as the starter.{{cite web|url=https://www.espn.com/espn/wire?section=nfl&id=1894848 |title=Saints acquire disgruntled CB McKenzie from Packers |publisher=ESPN |date=October 4, 2004 |access-date=September 20, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160920200202/http://www.espn.com/espn/wire?section=nfl&id=1894848 |archive-date=September 20, 2016 }}{{cite web|url=http://usatoday30.usatoday.com/sports/football/2007-06-21-3345910593_x.htm |title=O'Sullivan takes another pass at a World Bowl ring |work=USA Today |agency=Associated Press |date=June 21, 2007 |access-date=September 20, 2016 |author=Kammerer, Roy |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160920201540/http://usatoday30.usatoday.com/sports/football/2007-06-21-3345910593_x.htm |archive-date=September 20, 2016 }}{{cite web|url=http://articles.philly.com/2004-06-11/sports/25368860_1_europe-quarterbacks-berlin-thunder-o-sullivan |title=Proving Grounds NFL Europe tests and teaches prospects |work=The Philadelphia Inquirer |date=June 11, 2004 |access-date=September 20, 2016 |author=Fitzpatrick, Frank |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160920203116/http://articles.philly.com/2004-06-11/sports/25368860_1_europe-quarterbacks-berlin-thunder-o-sullivan |archive-date=September 20, 2016 }} His 91.9 passer rating was also second best in the league. O'Sullivan missed the final two games of the regular season due to his father's death. The Galaxy finished the year with a 7–3 regular season record, which granted them a berth in World Bowl XII.{{cite web | url=http://www.footballdb.com/teams/nfle/frankfurt-galaxy/results/2004 | title=2004 Frankfurt Galaxy Schedule & Results | publisher=FootballDB.com | access-date=September 20, 2016 | archive-url=https://web.archive.org/web/20160920202801/http://www.footballdb.com/teams/nfle/frankfurt-galaxy/results/2004 | archive-date=September 20, 2016 | url-status=live }} In World Bowl XII, against the Berlin Thunder, he completed 19 of 33 passes for 210 yards and 3 touchdowns with 2 interceptions in the 30–24 loss.{{cite web|url=http://www.post-gazette.com/sports/steelers/2004/06/13/NFL-Notebook-Thunder-rumbles-to-World-Bowl-win/stories/200406130149 |title=NFL Notebook: Thunder rumbles to World Bowl win |work=Pittsburgh Post-Gazette |agency=The Associated Press |date=June 13, 2004 |access-date=September 20, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160920195410/http://www.post-gazette.com/sports/steelers/2004/06/13/NFL-Notebook-Thunder-rumbles-to-World-Bowl-win/stories/200406130149 |archive-date=September 20, 2016 }}{{cite web | url=http://www.footballdb.com/games/boxscore.html?gid=2004061201 | title=World Bowl XII | publisher=FootballDB.com | access-date=September 20, 2016 | archive-url=https://web.archive.org/web/20160920195225/http://www.footballdb.com/games/boxscore.html?gid=2004061201 | archive-date=September 20, 2016 | url-status=live }}

He was inactive as the Saints' third quarterback for the first four games of the 2004 season.

=Green Bay Packers=

O'Sullivan and a second round pick in the 2005 NFL draft were traded to the Green Bay Packers for Mike McKenzie on October 4, 2004.{{cite web | url=https://www.nytimes.com/2004/10/05/sports/football/packers-trade-mckenzie-and-acquire-quarterback.html?_r=0 | title=Packers Trade McKenzie and Acquire Quarterback | work=The New York Times | agency=The Associated Press | date=October 5, 2004 | access-date=September 6, 2016 | archive-url=https://web.archive.org/web/20180517185435/https://www.nytimes.com/2004/10/05/sports/football/packers-trade-mckenzie-and-acquire-quarterback.html?_r=0 | archive-date=May 17, 2018 | url-status=live }} After the trade, O'Sullivan was inactive for 11 games as the third quarterback.{{cite web|url=http://www.kffl.com/player/765/nfl/news |title=Doug Pederson |publisher=KFFL.com |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160922025221/http://www.kffl.com/player/765/nfl/news |archive-date=September 22, 2016 }} He then played the first regular season game of his career on January 2, 2005, in the season finale, when he took a knee twice to end the game.{{cite web|url=http://www.detroitlions.com/bio.cfm?bio_id=466&season=9 |title=J. T. O'Sullivan |publisher=Detroit Lions |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20080626090505/http://www.detroitlions.com/bio.cfm?bio_id=466&season=9 |archive-date=June 26, 2008 }}{{cite web | url=https://www.pro-football-reference.com/players/O/OSulJ.00/gamelog/ | title=J.T. O'Sullivan | publisher=Pro Football Reference | access-date=September 6, 2016 | archive-url=https://web.archive.org/web/20160913234603/http://www.pro-football-reference.com/players/O/OSulJ.00/gamelog/ | archive-date=September 13, 2016 | url-status=live }}{{cite web|url=http://www.pressdemocrat.com/csp/mediapool/sites/PressDemocrat/News/story.csp?cid=2169157&sid=555&fid=181 |title=He?s a quarterback with almost no NFL game experience and has been told repeatedly he?s not good enough. All that?s done is motivate him to become the 49ers? most important player |work=The Press Democrat |date=September 1, 2008 |access-date=September 18, 2016 |author=Maiocco, Matt |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160919002814/http://www.pressdemocrat.com/csp/mediapool/sites/PressDemocrat/News/story.csp?cid=2169157&sid=555&fid=181 |archive-date=September 19, 2016 }} He was also inactive for the team's Wild Card Round playoff game. O'Sullivan re-signed with the Packers on April 22, 2005.{{cite web|url=http://www0.nfl.packers.com/news/releases/2005/04/22/1/ |title=Packers Sign LB Ray Thompson; Re-Sign Barry, O'Sullivan |publisher=nfl.packers.com |date=April 22, 2005 |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907031120/http://www0.nfl.packers.com/news/releases/2005/04/22/1/ |archive-date=September 7, 2016 }} He was released by the team on September 3, 2005.{{cite web|url=https://www.espn.com/nfl/transactions/_/date/20050905 |title=NFL Transactions |publisher=ESPN |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907194114/http://www.espn.com/nfl/transactions/_/date/20050905 |archive-date=September 7, 2016 }}{{cite web|url=http://www.deseretnews.com/article/600161110/Transactions.html?pg=all |title=Transactions |work=Deseret News |date=September 4, 2005 |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907031402/http://www.deseretnews.com/article/600161110/Transactions.html?pg=all |archive-date=September 7, 2016 }}

=Chicago Bears (first stint)=

O'Sullivan was signed to the Chicago Bears' practice squad on September 5, 2005.

=Minnesota Vikings=

He was signed off the Bears' practice squad by the Minnesota Vikings on November 8, 2005, after Daunte Culpepper suffered a season-ending injury.{{cite web|url=https://www.espn.com/nfl/news/story?id=2218065 |title=Bears release fullback Edwards |publisher=ESPN |date=November 8, 2005 |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907031854/http://www.espn.com/nfl/news/story?id=2218065 |archive-date=September 7, 2016 }} He was then inactive as the Vikings third quarterback for the final eight games of the season. O'Sullivan was released by the Vikings on September 2, 2006.{{cite web|url=https://www.espn.com/nfl/transactions/_/date/20060905 |title=NFL Transactions |publisher=ESPN |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921195449/http://www.espn.com/nfl/transactions/_/date/20060905 |archive-date=September 21, 2016 }}

=New England Patriots=

He was signed to the New England Patriots' practice squad on September 5, 2006.{{cite web|url=http://www.patriots.com/news/2006/09/05/patriots-sign-qb-jt-osullivan-practice-squad |title=Patriots Sign QB J.T. O'Sullivan to Practice Squad |publisher=New England Patriots |date=September 5, 2006 |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907032323/http://www.patriots.com/news/2006/09/05/patriots-sign-qb-jt-osullivan-practice-squad |archive-date=September 7, 2016 }} He was released by the team on October 2, 2006.{{cite web|url=http://www.scout.com/nfl/patriots/story/575584-roster-changes-no-big-surprise |title=Roster Changes No Big Surprise |publisher=Scout.com |date=October 3, 2006 |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921195843/http://www.scout.com/nfl/patriots/story/575584-roster-changes-no-big-surprise |archive-date=September 21, 2016 }}

=Carolina Panthers=

O'Sullivan was signed to the Carolina Panthers' practice squad in December 2006.{{cite web|url=http://query.nytimes.com/gst/fullpage.html?res=9506EEDD1F31F93BA15751C1A9609C8B63 |title=TRANSACTIONS |work=The New York Times |date=December 28, 2006 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907191236/http://query.nytimes.com/gst/fullpage.html?res=9506EEDD1F31F93BA15751C1A9609C8B63 |archive-date=September 7, 2016 }}

=Second stint with Bears and Galaxy=

In February 2007, he signed with the Bears. O'Sullivan was assigned to the Frankfurt Galaxy of NFL Europa on February 24, 2007. In 2007, he completed 174 of 254 passes for 2,201 yards, 16 touchdowns, and 7 interceptions with a 104.8 passer rating. He led the league in passer rating and passing yards while also tying Casey Bramlet for the league lead in touchdown passes.{{cite web|url=http://www.nfleurope.com/news/story/10232806 |title=Honors handed out |publisher=NFL Europe |date=June 21, 2007 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20070626020117/http://www.nfleurope.com/news/story/10232806 |archive-date=June 26, 2007 }}{{cite web|url=http://www.nfl.com/global/34players |title=Thirty-four NFL players compete in World Bowl |publisher=NFL.com |date=June 22, 2007 |access-date=September 20, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160920181607/http://www.nfl.com/global/34players |archive-date=September 20, 2016 }}{{cite news | url=https://www.pressreader.com/usa/the-detroit-news/20070711/282913791084149 | title=Lions snatch fourth QB | work=The Detroit News | date=July 11, 2007 | access-date=September 20, 2016 | author=Twentyman, Tim | archive-url=https://web.archive.org/web/20160923024554/https://www.pressreader.com/usa/the-detroit-news/20070711/282913791084149 | archive-date=September 23, 2016 | url-status=live }} O'Sullivan recorded the league's only two 300 passing yards games of the 2007 season and threw for 374 yards in Week 9 against the Hamburg Sea Devils. On June 21, 2007, O'Sullivan and Cologne Centurions running back Derrick Ross were named the 2007 NFL Europa Co-Offensive MVPs. They both earned All-NFL Europa honors as well. He started all ten of the team's games, leading them to a 7–3 record and a berth in World Bowl XV, which the Galaxy lost to the Hamburg Sea Devils by a score of 37–28.{{cite web | url=http://www.footballdb.com/games/boxscore.html?gid=2007062301 | title=World Bowl XV | publisher=FootballDB.com | access-date=September 7, 2016 | archive-url=https://web.archive.org/web/20160907183657/http://www.footballdb.com/games/boxscore.html?gid=2007062301 | archive-date=September 7, 2016 | url-status=live }} He completed 23 of 39 passes for 299 yards and two touchdowns with one interception in World Bowl XV.{{cite web |url=http://usatoday30.usatoday.com/sports/football/2007-06-23-world-bowl_N.htm |title=Bramlet leads Sea Devils to World Bowl victory |work=USA Today |agency=Associated Press |date=June 23, 2007 |access-date=September 20, 2016 |url-status=dead |archive-url=https://web.archive.org/web/20160920193845/http://usatoday30.usatoday.com/sports/football/2007-06-23-world-bowl_N.htm |archive-date=September 20, 2016 }}

O'Sullivan was released by the Bears in July 2007.{{cite web|url=https://www.chicagotribune.com/2007/07/11/bears-part-ways-with-qb-osullivan/ |title=Bears part ways with QB O'Sullivan |work=Chicago Tribune |date=July 11, 2007 |access-date=September 7, 2016 |author=Mullin, John |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907195740/http://articles.chicagotribune.com/2007-07-11/sports/0707110015_1_bears-northern-illinois-jon-kitna |archive-date=September 7, 2016 }}

=Detroit Lions=

O'Sullivan signed a one-year contract with the Detroit Lions in July 2007.{{Cite web |last=Pasquarelli |first=Len |author-link=Len Pasquarelli |date=July 13, 2007 |title=O'Sullivan gets another shot at making NFL roster |url=https://www.espn.com/nfl/news/story?id=2930814 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907195342/http://www.espn.com/nfl/news/story?id=2930814 |archive-date=September 7, 2016 |access-date=September 7, 2016 |publisher=ESPN}} Due to injuries to Detroit's other two quarterbacks, Dan Orlovsky and starter Jon Kitna, O'Sullivan played the Lions' final two 2007 preseason games in their entirety.{{cite web|url=http://www.cbssports.com/nfl/gametracker/recap/NFL_20070830_BUF%40DET |title=Bills rally past Lions; rookie QB Edwards leads winning drive |publisher=CBS Sports |date=August 30, 2007 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907200004/http://www.cbssports.com/nfl/gametracker/recap/NFL_20070830_BUF%40DET |archive-date=September 7, 2016 }} O'Sullivan was the primary backup to Kitna in 2007.{{cite web|url=http://www.toledoblade.com/DaveHackenberg/2007/08/10/Backup-QBs-make-Lions-look-good.html |title=Backup QBs make Lions look good |work=The Blade |date=August 10, 2007 |access-date=September 21, 2016 |author=Hackenburg, Dave |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160922011452/http://www.toledoblade.com/DaveHackenberg/2007/08/10/Backup-QBs-make-Lions-look-good.html |archive-date=September 22, 2016 }}{{cite web|url=http://www.themorningsun.com/article/MS/20080917/SPORTS/309179949 |title=Martz has revenge in mind for the Lions |work=The Morning Sun |date=September 17, 2008 |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160922011641/http://www.themorningsun.com/article/MS/20080917/SPORTS/309179949 |archive-date=September 22, 2016 }} On September 16, Kitna suffered a concussion early in the second quarter against the Vikings and was relieved by O'Sullivan, who was making his second career regular season appearance.{{cite web|url=http://www.twincities.com/2007/09/16/lions-qb-jon-kitna-shaken-up-in-second-quarter-against-vikings-but-returns-in-fourth/ |title=Lions QB Jon Kitna shaken up in second quarter against Vikings, but returns in fourth |work=St. Paul Pioneer Press |date=September 16, 2007 |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160922013455/http://www.twincities.com/2007/09/16/lions-qb-jon-kitna-shaken-up-in-second-quarter-against-vikings-but-returns-in-fourth/ |archive-date=September 22, 2016 }} He then completed 13 of 24 passes for 148 yards, two interceptions and his first career touchdown, which was a seven-yarder to Calvin Johnson, before Kitna returned to the game midway through the fourth quarter.{{cite web|url=http://49ers.com/team/roster_detail.php?PRKey=174 |title=J.T. O'Sullivan |publisher=San Francisco 49ers |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20090220002255/http://49ers.com/team/roster_detail.php?PRKey=174 |archive-date=February 20, 2009 }} The Lions won 20–17 in overtime. O'Sullivan played in four games for the Lions in 2007, recording season passing totals of 13 completions, 26 attempts, 148 yards, one touchdown, and two interceptions.

=San Francisco 49ers=

File:O'Sullivan & Snyder at Rams at 49ers 11-16-08.JPG in 2008]]

After hiring O'Sullivan's former offensive coordinator with the Lions, Mike Martz, the San Francisco 49ers signed O'Sullivan to a one-year contract for the veteran's minimum of $645,000 on February 29, 2008.{{cite web|url=https://www.espn.com/nfl/news/story?id=3269418 |title=Dolphins sign guard Smiley to 5-year, $25M deal |publisher=ESPN |date=February 29, 2008 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907200639/http://www.espn.com/nfl/news/story?id=3269418 |archive-date=September 7, 2016 }}{{cite web|url=http://blog.mlive.com/highlightreel/2008/02/san_francisco_49ers_sign_detro.html |title=San Francisco 49ers sign Detroit Lions backup QB J.T. O'Sullivan |publisher=MLive Media Group |date=February 29, 2008 |access-date=September 7, 2016 |author=Zaroo, Philip |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907201008/http://blog.mlive.com/highlightreel/2008/02/san_francisco_49ers_sign_detro.html |archive-date=September 7, 2016 }}{{cite web|url=http://usatoday30.usatoday.com/sports/football/nfl/niners/2008-09-18-osullivan_N.htm |title=Will 49ers, O'Sullivan make Lions regret his departure? |work=USA Today |date=September 19, 2008 |access-date=September 8, 2016 |author=Cotsonika, Nicholas J. |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160909013539/http://usatoday30.usatoday.com/sports/football/nfl/niners/2008-09-18-osullivan_N.htm |archive-date=September 9, 2016 }} On August 12, head coach Mike Nolan appeared on a local radio show and announced that O'Sullivan had moved into the lead for the 49ers starting quarterback job.{{cite web|url=http://www.kffl.com/player/5776/nfl/news/j.t.-o-sullivan |title=J.T. O'Sullivan |publisher=KFFL.com |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907205809/http://www.kffl.com/player/5776/nfl/news/j.t.-o-sullivan |archive-date=September 7, 2016 }}

On August 22, Nolan officially declared O'Sullivan as the starting quarterback for the 2008 season.{{cite web | url=https://www.espn.com/nfl/trainingcamp08/news/story?id=3549399 | title=O'Sullivan to start for 49ers in season opener | publisher=ESPN | date=August 23, 2008 | access-date=September 6, 2016 | author=Sando, Mike | archive-url=https://web.archive.org/web/20160907014403/http://www.espn.com/nfl/trainingcamp08/news/story?id=3549399 | archive-date=September 7, 2016 | url-status=live }} He became the first 49ers quarterback to throw for over 300 yards in a game since 2004 when he completed 20 of 32 passes for 321 yards and a touchdown in a 33–30 win over the Seattle Seahawks on September 14. O'Sullivan completed 16 of 28 passes for 256 yards, one touchdown and two interceptions in a 29–17 loss to the New York Giants on October 19. He was also sacked six times and fumbled four times, but only lost one fumble. Afterwards, Nolan said that the play of O'Sullivan in the Giants game was "disappointing".{{cite web|url=http://www.sfgate.com/sports/article/Champs-make-chumps-of-49ers-3189505.php |title=Champs make chumps of 49ers |work=SFGate |date=October 20, 2008 |access-date=September 7, 2016 |author=Crumpacker, John |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907210859/http://www.sfgate.com/sports/article/Champs-make-chumps-of-49ers-3189505.php |archive-date=September 7, 2016 }} On October 26, O'Sullivan, after throwing an interception that was returned for a touchdown, was benched in favor of Shaun Hill by new head coach Mike Singletary during the second quarter of a game against the Seahawks.{{cite web|url=http://www.seahawks.com/news/2008/10/26/hawks-win-san-francisco-34-13 |title=Hawks win in San Francisco, 34-13 |publisher=Seattle Seahawks |date=October 26, 2008 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907233933/http://www.seahawks.com/news/2008/10/26/hawks-win-san-francisco-34-13 |archive-date=September 7, 2016 }}{{cite web|url=http://www.twincities.com/2008/10/26/mike-singletary-benches-j-t-osullivan-vernon-davis-during-49ers-loss-to-seahawks/ |title=Mike Singletary benches J.T. O'Sullivan, Vernon Davis during 49ers' loss to Seahawks |work=St. Paul Pioneer Press |agency=Associated Press |date=October 26, 2008 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907234217/http://www.twincities.com/2008/10/26/mike-singletary-benches-j-t-osullivan-vernon-davis-during-49ers-loss-to-seahawks/ |archive-date=September 7, 2016 }} O'Sullivan committed three turnovers in total during the Seahawks game, the interception and two fumbles.

At the time of his benching, O'Sullivan and Brett Favre were tied for the league lead in interceptions with 11 and O'Sullivan led the league in fumbles with 11.{{cite web|url=http://profootballtalk.nbcsports.com/2008/10/28/osullivan-gets-obenched/ |title=O'SULLIVAN GETS O'BENCHED |publisher=NBC Sports |date=October 28, 2008 |access-date=September 7, 2016 |author=Florio, Mike |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160908031139/http://profootballtalk.nbcsports.com/2008/10/28/osullivan-gets-obenched/ |archive-date=September 8, 2016 }} He also led the league in total turnovers with 11 interceptions and six fumbles lost. O'Sullivan, by himself, had committed more turnovers than any other NFL team at the time of his demotion. The Denver Broncos, New York Jets and Cincinnati Bengals were tied for the second most turnovers with 16.{{cite web|url=http://blogs.mercurynews.com/49ers/2008/10/27/singletary-discusses-qbs-hints-at-hill/?doing_wp_cron=1473292928.3836710453033447265625 |title=Singletary discusses QBs, hints at Hill - 49ers Hot Read |work=The Mercury News |date=October 27, 2008 |access-date=September 7, 2016 |author=Brown, Daniel |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160908001422/http://blogs.mercurynews.com/49ers/2008/10/27/singletary-discusses-qbs-hints-at-hill/?doing_wp_cron=1473292928.3836710453033447265625 |archive-date=September 8, 2016 }} On October 27, Singletary named Hill the starting quarterback.{{Cite web |last=Clayton |first=John |date=October 28, 2008 |title=Singletary names Hill QB starter after benching O'Sullivan |url=https://www.espn.com/nfl/news/story?id=3667887 |url-status=live |archive-url=https://web.archive.org/web/20160907235449/http://www.espn.com/nfl/news/story?id=3667887 |archive-date=September 7, 2016 |access-date=September 7, 2016 |publisher=ESPN}} Hill then started the final eight games of the season.{{cite web | url=https://www.pro-football-reference.com/players/H/HillSh00/gamelog/2008/ | title=Shaun Hill | publisher=Pro Football Reference | access-date=September 7, 2016 | archive-url=https://web.archive.org/web/20160905232807/http://www.pro-football-reference.com/players/H/HillSh00/gamelog/2008/ | archive-date=September 5, 2016 | url-status=live }} O'Sullivan completed 128 of 220 passes for 1,678 yards and eight touchdowns with 11 interceptions during the 2008 season. The 49ers won two out of the eight games that he started. O'Sullivan, despite only starting eight games, was sacked 32 times, which made him tied for eighth in the NFL with Joe Flacco in number of times sacked.{{cite web | url=https://www.pro-football-reference.com/years/2008/passing.htm | title=2008 NFL Passing | publisher=Pro Football Reference | access-date=September 8, 2016 | archive-url=https://web.archive.org/web/20160908005644/http://www.pro-football-reference.com/years/2008/passing.htm | archive-date=September 8, 2016 | url-status=live }}{{cite web|url=http://www.sportsnet.ca/football/cfl/saskatchewan-roughriders-sign-quarterback-jt-osullivan/ |title=Roughriders sign ex-NFL QB O'Sullivan |publisher=Sportsnet |date=April 19, 2012 |access-date=September 8, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160908182627/http://www.sportsnet.ca/football/cfl/saskatchewan-roughriders-sign-quarterback-jt-osullivan/ |archive-date=September 8, 2016 }}

=Cincinnati Bengals=

An unrestricted free agent in the 2009 offseason, O'Sullivan signed a two-year contract with the Cincinnati Bengals in March 2009.{{cite web|url=https://www.espn.com/nfl/transactions/_/date/20090306 |title=NFL Transactions |publisher=ESPN |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921205455/http://www.espn.com/nfl/transactions/_/date/20090306 |archive-date=September 21, 2016 }}{{cite news|url=https://www.newspapers.com/newspage/102964510/ |title=O'Sullivan could sign as backup QB today |work=The Cincinnati Enquirer |date=March 5, 2009 |access-date=September 21, 2016 |pages=23 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921210200/https://www.newspapers.com/newspage/102964510/ |archive-date=September 21, 2016 }} He was active as the Bengals second quarterback for every regular season game during the 2009 season.{{cite web|url=http://www.bengals.com/team/roster/jt-osullivan/228867a3-bdf4-4b3a-bce2-5f4f0baf29ef/ |title=J.T. O'Sullivan |publisher=Cincinnati Bengals |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160920025125/http://www.bengals.com/team/roster/jt-osullivan/228867a3-bdf4-4b3a-bce2-5f4f0baf29ef/ |archive-date=September 20, 2016 }} He played in three games, completing four of eleven passes for 40 yards with no touchdowns or interceptions. O'Sullivan was also active, but did not play, in the team's AFC wild card game. He was released by the Bengals on September 5, 2010.{{cite web|url=http://www.nfl.com/news/story/09000d5d81a4aae6/article/bengals-cut-veteran-qb-osullivan-claim-rookie-lefevour |title=Bengals cut veteran QB O'Sullivan, claim rookie LeFevour |publisher=NFL.com |date=September 5, 2010 |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160922005722/http://www.nfl.com/news/story/09000d5d81a4aae6/article/bengals-cut-veteran-qb-osullivan-claim-rookie-lefevour |archive-date=September 22, 2016 }}{{cite web|url=http://www.bengals.com/news/article-1/Bengals-spread-QB-field-to-add-LeFevour-cut-OSullivan/3cb0fd5f-09fd-4ce9-9c02-1f0c2ddfbcbc |title=Bengals spread QB field to add LeFevour, cut O'Sullivan |publisher=Cincinnati Bengals |date=September 5, 2010 |access-date=September 21, 2016 |author=Hobson, Geoff |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921210311/http://www.bengals.com/news/article-1/Bengals-spread-QB-field-to-add-LeFevour-cut-OSullivan/3cb0fd5f-09fd-4ce9-9c02-1f0c2ddfbcbc |archive-date=September 21, 2016 }}

=San Diego Chargers=

After O'Sullivan was cut by the Bengals, the San Diego Chargers claimed him off waivers on September 6, 2010.{{cite web|url=http://www.nfl.com/news/story/09000d5d81a50db9/printable/chargers-add-depth-at-quarterback-by-signing-osullivan |title=Chargers add depth at quarterback by signing O'Sullivan |publisher=NFL.com |agency=Associated Press |date=September 6, 2010 |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921210739/http://www.nfl.com/news/story/09000d5d81a50db9/printable/chargers-add-depth-at-quarterback-by-signing-osullivan |archive-date=September 21, 2016 }} He was inactive as the Chargers third quarterback for six games.{{cite web|url=http://www.lajollalight.com/sdljl-chargers-sign-kicker-as-kaeding-recovers-from-2010oct20-story.html |title=Chargers sign kicker as Kaeding recovers from groin injury |work=La Jolla Light |date=October 20, 2010 |access-date=September 21, 2016 |author=Day, Kathy |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160922021441/http://www.lajollalight.com/sdljl-chargers-sign-kicker-as-kaeding-recovers-from-2010oct20-story.html |archive-date=September 22, 2016 }} He was released by the team on October 20, 2010.{{cite web|url=http://www.nfl.com/news/story/09000d5d81b7ad1c/article/kaeding-nursing-groin-injury-so-chargers-sign-kicker-brown |title=Kaeding nursing groin injury, so Chargers sign kicker Brown |publisher=NFL.com |agency=Associated Press |date=October 20, 2010 |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921210906/http://www.nfl.com/news/story/09000d5d81b7ad1c/article/kaeding-nursing-groin-injury-so-chargers-sign-kicker-brown |archive-date=September 21, 2016 }} In November 2010, he had workouts with the Miami Dolphins and Detroit Lions.

=Oakland Raiders=

O'Sullivan was signed by the Oakland Raiders on December 2, 2010, after quarterback Bruce Gradkowski was placed on season-ending injured reserve.{{cite web|url=http://www.foxsports.com/nfl/story/Raiders-sign-backup-QB-JT-OSullivan-00666545-120210 |title=Raiders sign backup QB J.T. O'Sullivan |publisher=Fox Sports |agency=Associated Press |date=December 2, 2010 |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921230052/http://www.foxsports.com/nfl/story/Raiders-sign-backup-QB-JT-OSullivan-00666545-120210 |archive-date=September 21, 2016 }}{{cite web|url=http://content.usatoday.com/communities/thehuddle/post/2010/12/raiders-place-qb-bruce-gradkowki-on-season-ending-ir/1 |title=Raiders place QB Bruce Gradkowki on season-ending IR |work=USA Today |date=December 2, 2010 |access-date=September 7, 2016 |author=Corbett, Jim |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160908003657/http://content.usatoday.com/communities/thehuddle/post/2010/12/raiders-place-qb-bruce-gradkowki-on-season-ending-ir/1#.V9Cyyk0rKUk |archive-date=September 8, 2016 }} He was inactive as the Raiders third quarterback for five games.{{cite web|url=http://www.raiders.com/team/roster/J.T.-O%27Sullivan/OSU394627 |title=J.T. O'Sullivan |publisher=Oakland Raiders |access-date=September 21, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160920025147/http://www.raiders.com/team/roster/J.T.-O%27Sullivan/OSU394627 |archive-date=September 20, 2016 }} The Raiders were the last NFL team he played for. He became a free agent in July 2011.{{cite web|url=http://www.ibabuzz.com/oaklandraiders/2011/07/25/list-of-raiders-unrestricted-free-agents/ |title=List of Raiders unrestricted free agents |publisher=Ibabuzz.com |date=July 25, 2011 |access-date=September 21, 2016 |author=Corkran, Steve |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160921230626/http://www.ibabuzz.com/oaklandraiders/2011/07/25/list-of-raiders-unrestricted-free-agents/ |archive-date=September 21, 2016 }}

=Saskatchewan Roughriders=

O'Sullivan was signed by the Saskatchewan Roughriders of the Canadian Football League on April 19, 2012.{{cite web|url=https://www.cfl.ca/2012/04/19/riders-release-veteran-romero-sign-four/ |title=RIDERS RELEASE VETERAN ROMERO, SIGN FOUR |publisher=CFL.ca |date=April 19, 2012 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160908015042/http://www.cfl.ca/2012/04/19/riders-release-veteran-romero-sign-four/ |archive-date=September 8, 2016 }} He was the team's third-string quarterback for most of the season, behind starter Darian Durant and rookie Drew Willy. O'Sullivan dressed for all 18 of the team's games in 2012, but played in just one game, completing nine of fourteen passes for 83 yards and rushing once for four yards.{{cite web|url=http://www.cflapedia.com/Players/o/osullivan_jt.htm |title=J.T. O'sullivan |publisher=CFLapedia.com |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160907011625/http://www.cflapedia.com/Players/o/osullivan_jt.htm |archive-date=September 7, 2016 }}{{cite web|url=http://cfl.ca/roster/show/id/5027 |title=J.T. O'Sullivan |publisher=CFL.ca |access-date=September 6, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20150621134252/http://cfl.ca/roster/show/id/5027 |archive-date=June 21, 2015 }} He was released by the team on March 8, 2013.{{cite web|url=https://www.cfl.ca/2013/03/08/roughriders-release-wr-moss-qb-osullivan/ |title=ROUGHRIDERS RELEASE WR MOSS, QB O'SULLIVAN |publisher=CFL.ca |date=March 8, 2013 |access-date=September 7, 2016 |url-status=bot: unknown |archive-url=https://web.archive.org/web/20160908015341/http://www.cfl.ca/2013/03/08/roughriders-release-wr-moss-qb-osullivan/ |archive-date=September 8, 2016 }}

=NFL statistics=

class="wikitable sortable" style="text-align:center"

! rowspan=2 | Year !! rowspan=2 | Team !! rowspan=2 | {{tooltip|GP|Games played}} !! rowspan=2 | {{tooltip|GS|Games started}} !! colspan=8 | Passing !! colspan=4 | Rushing

{{tooltip|Cmp|Passes completed}}{{tooltip|Att|Passes attempted}}{{tooltip|Pct|Completion percentage}}{{tooltip|Yds|Passing yards}}{{tooltip|Y/A|Yards per passing attempt}}{{tooltip|TD|Passing touchdowns}}{{tooltip|Int|Interceptions}}{{tooltip|Rtg|Passer rating}}{{tooltip|Att|Rushing attempts}}{{tooltip|Yds|Rushing yards}}{{tooltip|Avg|Yards per rushing attempt}}{{tooltip|TD|Rushing touchdowns}}
2004GB10000.000.0000.02−2−1.00
2007DET40132650.01485.71248.24−10−2.50
2008SF9812822058.21,6787.681173.6301454.80
2009CIN3041136.4403.60047.53124.00
class="sortbottom" style="background:#eee;"

| colspan=2 | Career

17814525756.41,8667.391369.9391453.70

Source:{{cite web | url=https://www.pro-football-reference.com/players/O/OSulJ.00.htm | title=J.T. O'Sullivan | publisher=Pro Football Reference | accessdate=September 6, 2016}}

Post-playing career

O'Sullivan spent time as a member of the compliance staff of San Diego State University's athletic department {{cite web|url=http://www.goaztecs.com/ot/compliance.html |title=SDSU ATHLETIC COMPLIANCE |publisher=San Diego State University |accessdate=September 18, 2016 |archiveurl=https://web.archive.org/web/20160919020719/http://www.goaztecs.com/ot/compliance.html |archivedate=September 19, 2016 |df= }} He completed his Ph.D. in Leadership studies at the University of San Diego in 2017.{{Cite magazine|last=Patterson|first=Luke|title=QB Guru Reveals How Drew Lock can Capitalize on Closing Window of Opportunity|url=https://www.si.com/nfl/broncos/news/qb-guru-reveals-how-drew-lock-can-capitalize-on-closing-window-of-opportunity|access-date=April 2, 2021|magazine=Sports Illustrated|date=November 12, 2020 |language=en}}

In 2018, O'Sullivan started the YouTube channel "The QB School", where he analyzes game tape of college and pro quarterbacks.{{Cite web |last=Fahrenthold |first=Clark |date=November 15, 2020 |title=J.T. O'Sullivan: From NFL QB to Football Talent Evaluator |url=https://coronadotimes.com/news/2020/11/14/j-t-osullivan-from-nfl-qb-to-football-talent-evaluator/ |access-date=March 18, 2023 |website=Corando Times}}{{Citation|title=What Happened in Year One of the QB School???|via=YouTube|url=https://www.youtube.com/watch?v=J-3WVTkuHlo |archive-url=https://ghostarchive.org/varchive/youtube/20211219/J-3WVTkuHlo |archive-date=December 19, 2021 |url-status=live|language=en|access-date=October 22, 2019}}{{cbignore}} He was the head football coach of Patrick Henry High School in San Diego from 2019 to 2021, accruing a 20–10 record.{{cite web|url=https://www.partletonsports.com/2021-about-sutton-gardinera-osullivan/|title=2021 Football: About Sutton, Gardinera, O'Sullivan|publisher=PartletonSports.com|date=December 26, 2021|access-date=January 2, 2023}}

References

{{reflist|30em}}