Mathew Rosengart

Mathew Rosengart earned his undergraduate degree from Tulane University and his J.D. degree from Boston College Law School (graduating cum laude, in 1987). After graduation, Rosengart served as a law clerk in the New Hampshire Supreme Court for Justice David Souter. He later served as a supervisory assistant United States attorney and Trial Attorney for the U.S. Department of Justice, where he earned the Justice Department's Special Achievement Award.{{Cite web|title=Time to Amend the Presidential Transition Act of 1963|url=https://www.dailyjournal.com/articles/360631-time-to-amend-the-presidential-transition-act-of-1963|access-date=2021-08-14|website=www.dailyjournal.com}}

As an Assistant U.S. Attorney, Mathew Rosengart prosecuted the case of Ralph Gene Johnson, who stalked and attempted to kidnap Gay Culverhouse, former president of the Tampa Bay Buccaneers and daughter of the former owner of the Buccaneers, Hugh Culverhouse.{{Cite news|last=Litsky|first=Frank|date=1994-08-26|title=Hugh Culverhouse, 75, Owner of the Buccaneers|language=en-US|work=The New York Times|url=https://www.nytimes.com/1994/08/26/obituaries/hugh-culverhouse-75-owner-of-the-buccaneers.html|access-date=2021-08-14|issn=0362-4331}} Johnson also attempted to kidnap Gay's 20-year-old daughter in a ransom attempt. Following Rosengart's arguments, Johnson was convicted and sentenced to 27 years.{{Cite news|date=December 15, 1995|title=Stalker of Culverhouse Family Sentenced to 27 Years|work=AP News |url=https://apnews.com/article/02b522d11c53394b604df61ed3382f7a}}{{Cite web|title=Stalker is sentenced to 27 years|url=https://www.tampabay.com/archive/1995/12/15/stalker-is-sentenced-to-27-years/|access-date=2021-08-14|website=Tampa Bay Times|language=en}}

Also, in his capacity as an Assistant U.S. Attorney, Rosengart secured trial convictions in the cases of United States v. Mark Dale Viscome and United States v. Samuel Gentile.{{Cite web|title=FindLaw's United States Eleventh Circuit case and opinions.|url=https://caselaw.findlaw.com/us-11th-circuit/1392154.html|access-date=2021-08-15|website=Findlaw|language=en-US}} Samuel Gentile of Clearwater, Florida, was sentenced to more than 46 years for attempting to kill his estranged wife with a pipe bomb. Mark Viscome, an accomplice, was sentenced to more than 20 years.{{Cite web|title=Clearwater man sentenced to 46 years in bomb case|url=https://www.tampabay.com/archive/1996/10/12/clearwater-man-sentenced-to-46-years-in-bomb-case/|access-date=2021-08-15|website=Tampa Bay Times|language=en}}

In 2000, Rosengart worked as a Trial Attorney for the Justice Department's Campaign Financing Task Force under the direction of Attorney General Janet Reno. Rosengart worked on the case United States v. James Riady, which charged Riady, an Indonesian billionaire, with conspiracy to defraud the U.S. for having made illegal campaign contributions. Rosengart conducted a money laundering investigation and obtained a felony conviction against Riady, and secured an $8.6 million fine—the largest campaign finance fine at that time.{{Cite news|last=Pear|first=Robert|date=2001-01-12|title=Indonesian Set To Make Plea In Donations|language=en-US|work=The New York Times|url=https://www.nytimes.com/2001/01/12/us/indonesian-set-to-make-plea-in-donations.html|access-date=2021-08-14|issn=0362-4331}} The head of the Campaign Financing Task Force was now U.S. District Judge Robert J. Conrad, who said: "Matt Rosengart is one of the sharpest lawyers I've ever met at the Department of Justice" whose "judgment is impeccable."

After being appointed Senior Associate Independent Counsel in a case commenced at the request of then U.S. Attorney General Janet Reno, Rosengart represented the U.S. in the case United States of America, Appellee, v. Henry G. Cisneros, Appellant in 1999.{{Cite web|title=FindLaw's United States DC Circuit case and opinions.|url=https://caselaw.findlaw.com/us-dc-circuit/1078496.html|access-date=2021-08-14|website=Findlaw|language=en-US}} Cisneros, the former Secretary of Housing and Urban Development, had been accused of lying to the FBI. Rosengart helped secure Cisneros’ conviction, and won the appeal on behalf of the U.S. government.{{Cite web|title=United States of America, Appellee, v. Henry G. Cisneros, Appellant, 169 F.3d 763 (D.C. Cir. 1999)|url=https://law.justia.com/cases/federal/appellate-courts/F3/169/763/491088/|access-date=2021-08-14|website=Justia Law|language=en}}{{Cite web|title=United States v. Cisneros, 26 F. Supp. 2d 24 (D.D.C. 1998)|url=https://law.justia.com/cases/federal/district-courts/FSupp2/26/24/2406661/|access-date=2021-08-14|website=Justia Law|language=en}}

In 2001, Rosengart departed from his role as a government prosecutor and went into private practice. His primary practice areas are media and entertainment litigation, commercial litigation, and white collar defense. In 2011, he joined the law firm, Greenberg Traurig.

Rosengart has worked on numerous high-profile cases, including those involving Britney Spears, Sean Penn, Winona Ryder, Julia Louis-Dreyfus, Keanu Reeves, Daymond John, and Steven Spielberg.{{Cite news|last1=Coscarelli|first1=Joe|last2=Day|first2=Liz|last3=Stark|first3=Samantha|date=2021-07-26|title=Britney Spears Files to Remove Her Father From Conservatorship|language=en-US|work=The New York Times|url=https://www.nytimes.com/2021/07/26/arts/music/britney-spears-conservatorship-father-jamie.html|access-date=2021-08-14|issn=0362-4331}}{{Cite news|title=Who Is Mathew Rosengart, Britney Spears' New Lawyer?|url=https://www.npr.org/2021/07/15/1016378951/britney-spears-new-lawyer-mathew-rosengart|access-date=2021-08-14|website=NPR|date=15 July 2021|language=en|last1=Tsioulcas|first1=Anastasia}} He has a "long history of getting results for his big name clients."{{Cite web|last=Stuart|first=Gwynedd|date=2021-07-15|title=Britney Spears's New Lawyer Is a Hollywood Heavy Hitter|url=https://www.lamag.com/citythinkblog/mathew-rosengart-britney-spears/|access-date=2021-08-14|website=Los Angeles Magazine|language=en-US}}

D/F Management hired Mathew Rosengart to represent the management company in its dispute versus Julianna Margulies, star of The Good Wife. D/F Management had signed Margulies to a contract in 2009. Margulies broke ties with the agency in 2011. Rosengart was hired to file a lawsuit against Margulies seeking damages for unpaid commissions totaling at least $420,000.{{Cite web|last=Gardner|first=Eriq|date=2013-08-28|title=Julianna Margulies, Ex-Manager Settling Commissions Lawsuit|url=https://www.hollywoodreporter.com/business/business-news/julianna-margulies-manager-settling-commissions-616699/|access-date=2021-08-14|website=The Hollywood Reporter|language=en-US}} Rosengart asserted that Margulies's counterclaims against his client were filed in bad faith. In August 2013, Rosengart negotiated a settlement between the two parties.{{Cite web|date=2013-08-29|title=Julianna Margulies settles legal dispute with former managers|url=https://www.express.co.uk/celebrity-news/425437/Julianna-Margulies-settles-legal-dispute-with-former-managers|access-date=2021-08-14|website=Express.co.uk|language=en}} The terms were not disclosed. In an interview, Rosengart said of the case: “All actors, especially experienced actors, understand the obligation to pay their managers post-termination commissions. That is the standard. It is routine. It is universal."{{Cite web|author=|title=Julianna Margulies Headed to Court to Battle Ex-Managers|url=http://abcnews.go.com/blogs/entertainment/2013/08/julianna-margulies-headed-to-court-to-battle-ex-managers|access-date=2021-08-14|website=ABC News|language=en}}

Mathew Rosengart successfully defended Kenneth Lonergan, an Oscar-winning writer, and director, from a lawsuit filed by Gary Gilbert. Gilbert was the producer of Lonergan's critically acclaimed film, Margaret, starring Matt Damon, Mark Ruffalo, and Anna Paquin. Gilbert filed a lawsuit after a post-production dispute. Of Margaret and Lonergan, Rosengart said, "The movie was dumped... Having gone through it, and him really believing it was his masterpiece, and having it be doomed, was devastating."{{Cite magazine|date=2016-10-30|title=The Cinematic Traumas of Kenneth Lonergan|url=https://www.newyorker.com/magazine/2016/11/07/the-cinematic-traumas-of-kenneth-lonergan|access-date=2021-08-15|magazine=The New Yorker|language=en-US}}

After Lonergan hired Rosengart as his legal counsel, Gilbert filed for dismissal of the lawsuit after it was clear that Damon, Ruffalo, Martin Scorsese, and other Hollywood notables were prepared to testify on behalf of Lonergan.{{Cite news|last=Lovell|first=Joel|date=2012-06-19|title=Kenneth Lonergan's Thwarted Masterpiece|language=en-US|work=The New York Times|url=https://www.nytimes.com/2012/06/24/magazine/kenneth-lonergans-thwarted-masterpiece.html|access-date=2021-08-15|issn=0362-4331}} Lonergan attributed the outcome of the case to Rosengart, saying in an interview, "After five years of expensive and highly contentious litigation, the plaintiff suddenly dropped all of his claims in the middle of the trial, without any guarantee of ever receiving a dime."{{Cite web|last=Gardner|first=Eriq|date=2014-04-02|title=Six-Year Legal Battle Over Kenneth Lonergan's 'Margaret' Finally Ends (Exclusive)|url=https://www.hollywoodreporter.com/business/business-news/six-year-legal-battle-kenneth-692235/|access-date=2021-08-15|website=The Hollywood Reporter|language=en-US}}

In September 2015, actor Sean Penn hired Mathew Rosengart to represent him in a dispute with Lee Daniels, a movie director who had implied in an interview with The Hollywood Reporter that Penn had physically abused his first wife, Madonna. Rosengart filed a defamation lawsuit against Daniels on Penn's behalf. Rosengart obtained and filed in New York Supreme Court an Affidavit from Madonna confirming that Penn had never physically assaulted her.{{Cite news|last=Holson|first=Laura M.|date=2016-03-18|title=Why Is Sean Penn Suing Lee Daniels?|language=en-US|work=The New York Times|url=https://www.nytimes.com/2016/03/20/fashion/sean-penn-suing-lee-daniels-madonna.html|access-date=2021-08-14|issn=0362-4331}} Rosengart negotiated a settlement on Penn's behalf, which involved the actor dropping the lawsuit in exchange for a retraction, an apology, and a charitable donation from Daniels.{{Cite web|last=Gardner|first=Eriq|date=2016-05-04|title=Sean Penn Wins Apology from Lee Daniels in Defamation Settlement|url=https://www.hollywoodreporter.com/business/business-news/sean-penn-wins-apology-lee-890533/|access-date=2021-08-14|website=The Hollywood Reporter|language=en-US}} In a statement to The New York Times, Penn said: "There's no litigator I'd rather have in my corner." Rosengart is "a tough as nails streetfighter with a big brain and bigger principles."

Rosengart represented Raven Capital Management an asset-based opportunity fund in their dispute with Green-Light International Films. Raven had provided loans totaling approximately $9 million to Green-Light for the production of two films. Green-Light was accused of using the money illicitly for expenses such as vacation and salaries.{{Cite web|last=Gardner|first=Eriq|date=2016-09-14|title=Sales Outfit Green-Light Challenges Arbitrator's Authority After Sanctioning in 'Urge' Dispute|url=https://www.hollywoodreporter.com/business/business-news/sales-outfit-green-light-challenges-928799/|access-date=2021-08-16|website=The Hollywood Reporter|language=en-US}} The case went to arbitration. The arbitrator, Jeffrey G. Benz, faulted Green-Light principals for lying under oath, failing to produce bank statements, and violating a distribution agreement. Green-Light was ordered to pay damages of $765,000 plus $1 million in attorneys’ fees and sanctions.{{Cite web|last=Maddaus|first=Gene|date=2017-07-11|title=Green-Light International Goes Bankrupt After Blistering Arbitrator's Ruling|url=https://variety.com/2017/biz/news/green-light-international-raven-stole-400000-arbitration-award-1202491441/|access-date=2021-08-16|website=Variety|language=en-US}}

Sandton Capital Partners, a hedge fund, hired Mathew Rosengart to defend a lawsuit against Gold Circle Films. The film production company had taken out roughly $76 million in loans from CIT Bank. CIT Bank then sold the loans to Sandton. Rosengart represented Sandton and asserted counterclaims after Gold Circle sued Sandton. The lawsuit was resolved in 2019 after a trial when New York Supreme Court Judge Barry Ostrager ordered Gold Circle Films to repay the balance of the loans, which equaled $14 million.{{Cite web|last=Maddaus|first=Gene|date=2019-06-06|title=Gold Circle Films Hit With $14 Million Judgment|url=https://variety.com/2019/biz/news/gold-circle-films-14-million-judgment-1203235297/|access-date=2021-08-15|website=Variety|language=en-US}}

Jimmy Butler, the Miami Heat All-Star guard, hired Mathew Rosengart as his legal counsel after his former sports management group, Independent Sports & Entertainment LLC (ISE), sued Butler for breach of contract in 2020. The lawsuit requested roughly $1 million of Butler's earnings from his Nike endorsement contract, worth $5 million.{{Cite web|title=Heat's Butler Beats Ex-Marketer's Suit Over Nike Deal - Law360|url=https://www.law360.com/articles/1381435/heat-s-butler-beats-ex-marketer-s-suit-over-nike-deal|access-date=2021-08-14|website=www.law360.com|language=en}} Rosengart developed a new legal strategy involving counterclaims that Butler was an “artist” under California law, which would have required ISE to have a special license issued by the California Labor Commissioner. ISE lacked the necessary license and opted to drop the litigation.{{Cite web|title=Expert Perspectives on Biggest Court Cases|url=https://www.law.com/litigationdaily/2021/05/06/to-defend-nba-star-jimmy-butler-against-claims-from-his-former-talent-agency-this-greenberg-traurig-partner-played-offense-407-17691/|access-date=2021-08-14|website=Litigation Daily {{!}} The American Lawyer|language=en}}

Between 2014 and 2021, Rosengart served as lead counsel for Verizon in a False Claims Act lawsuit involving claims that Verizon, AT&T, Sprint, and T-Mobile overcharged government customers.{{Cite web|date=2021-04-28|title=Verizon, AT&T reach $116 million California settlement|url=https://apnews.com/article/technology-sacramento-lawsuits-local-governments-california-ededbb0d8f9c73a7e71f793efae7452a|access-date=2021-08-16|website=AP NEWS|language=en}} California government entities alleged that the telecommunications carriers failed to meet contractual obligations concerning affordable cellphone plans. The plaintiffs demanded more than $1.5 billion from the defendants. The parties negotiated a settlement that allowed Verizon to pay $68 million instead. Combined, the telecommunications companies settled for a total of $116 million.{{Cite web|last7=Emai|date=2020-09-25|title=Verizon, AT&T to pay $116 million to settle California whistleblower lawsuit|url=https://www.latimes.com/business/story/2020-09-25/verizon-at-t-to-pay-116-million-to-settle-california-whistleblower-lawsuit|access-date=2021-08-16|website=Los Angeles Times|language=en-US}}{{Cite web|title=Verizon, AT&T To Pay Combined $116M For Calif. Overcharges - Law360|url=https://www.law360.com/articles/1313604/verizon-at-t-to-pay-combined-116m-for-calif-overcharges|access-date=2021-08-16|website=www.law360.com|language=en}}

{{Main|Britney Spears conservatorship case}}File:Matthew Rosengart 2.jpgOn July 14, 2021, singer Britney Spears hired Rosengart to represent her interests in her conservatorship dispute.{{Cite news|last1=Coscarelli|first1=Joe|last2=Day|first2=Liz|last3=Herstik|first3=Lauren|date=2021-07-14|title=Britney Spears Can Hire a New Lawyer of Her Choice, Judge Rules|language=en-US|work=The New York Times|url=https://www.nytimes.com/2021/07/14/arts/music/britney-spears-conservatorship-lawyer.html|access-date=2021-08-14|issn=0362-4331}} Rosengart was hired after Judge Brenda J. Penny ruled that Spears could hire her own legal counsel to replace the court-appointed lawyer, Samuel D. Ingham III, who resigned earlier that month.{{Cite web|date=2021-07-14|title=Judge allows Britney Spears to hire her own lawyer in conservatorship case|url=https://www.latimes.com/entertainment-arts/story/2021-07-14/britney-spears-can-hire-own-lawyer-in-conservatorship-case|access-date=2021-08-14|website=Los Angeles Times|language=en-US}} It was noted that the hiring of Rosengart signaled a more "aggressive" approach to the case.

On July 26, 2021, Rosengart filed a petition with the Los Angeles Superior Court requesting that Spears's father, Jamie Spears, be suspended or removed from his position as conservator of her estate. Rosengart's petition alleged Jamie had committed multiple acts of mismanagement and that his suspension or removal was in the best interests of Spears.{{Cite web|last=Maddaus|first=Gene|date=2021-08-05|title=Britney Spears' Lawyer Wants to Speed Up Process to Remove Her Father|url=https://variety.com/2021/music/news/britney-spears-conservatorship-father-hearing-1235035478/|access-date=2021-08-14|website=Variety|language=en-US}}

The petition came on the heels of Spears's accusations against her father on June 23, 2021,{{Cite web|last=Aswad|first=Jem|date=2021-06-23|title=Read Britney Spears' Full Statement Against Conservatorship: 'I Am Traumatized'|url=https://variety.com/2021/music/news/britney-spears-full-statement-conservatorship-1235003940/|access-date=2021-08-15|website=Variety|language=en-US}} alleging that Jamie has been abusing his authority and taking financial advantage of her.{{Cite magazine|date=2021-07-20|title=Britney Spears's New Lawyer Says He's "Moving Aggressively and Expeditiously" to Have Her Father Removed as Conservator|url=https://www.vanityfair.com/style/2021/07/britney-spears-lawyer-mathew-rosengart-moving-aggressively-to-remove-jamie-spears-conservatorship|access-date=2021-08-15|magazine=Vanity Fair|language=en-US}} On February 1, 2008, Spears was involuntarily admitted for mental health treatment by her then-estranged father. Jamie was named her co-conservator the same day.{{Cite news|last1=Halbfinger|first1=David M.|last2=Fabrikant|first2=Geraldine|date=2008-02-25|title=In the Drama of Britney Spears, a Show Business Fortune Is at Risk|language=en-US|work=The New York Times|url=https://www.nytimes.com/2008/02/25/business/media/25britney.html|access-date=2021-08-15|issn=0362-4331}} The conservatorship grants Jamie control over his daughter's fortune of nearly $60 million.

On August 5, 2021, Rosengart filed a petition requesting the court to reschedule the next hearing from September 29 to August 23 or immediately suspend the Jamie's position as co-conservator. The request was denied without prejudice by Judge Brenda J. Penny.{{Cite web|last=Puente|first=Maria|title=Judge denies Britney Spears' request to move up hearing that could remove her dad from conservatorship|url=https://www.usatoday.com/story/entertainment/celebrities/2021/08/09/britney-spears-conservatorship-lawyer-loses-bid-move-up-hearing/5504065001/|access-date=2021-08-15|website=USA Today|language=en-US}}

On August 12, 2021, in response to Rosengart's petition, Jamie filed paperwork with the Los Angeles Superior Court to remove himself as conservator.{{Cite web|title=Jamie Spears to step down as Britney Spears' conservator|url=https://www.ny1.com/nyc/all-boroughs/news/2021/08/12/britney-spears-jamie-spears-conservatorship-step-down|access-date=2021-08-15|website=www.ny1.com|language=en}} Spears conservatorship will temporarily remain with her father until the transition to a new financial conservator is completed.{{Cite news|title=Jamie Spears Agrees To Step Down From Britney Spears Conservatorship|url=https://www.npr.org/2021/08/12/1027223521/jamie-spears-steps-down-britney-spears-conservatorship|access-date=2021-08-15|website=NPR|date=12 August 2021|language=en|last1=Tsioulcas|first1=Anastasia}}

Rosengart expressed his approval for Jamie's decision to step down but indicated that he may still face legal repercussions for profiting from Spears's estate.{{Cite news|last1=Coscarelli|first1=Joe|last2=Day|first2=Liz|date=2021-08-12|title=Britney Spears's Father Says He Will Step Aside in Conservatorship Battle|language=en-US|work=The New York Times|url=https://www.nytimes.com/2021/08/12/arts/music/britney-spears-dad-conservatorship.html|access-date=2021-08-15|issn=0362-4331}} Rosengart stated, "We are pleased that Mr. Spears and his lawyer have today conceded in a filing that he must be removed. It is vindication for Britney. We are disappointed, however, by their ongoing shameful and reprehensible attacks on Ms. Spears and others."{{Cite news|last=Shah|first=Neil|date=2021-08-12|title=Britney Spears's Father to Exit Conservatorship|language=en-US|work=Wall Street Journal|url=https://www.wsj.com/articles/britney-spearss-father-to-exit-conservatorship-11628808022|access-date=2021-08-15|issn=0099-9660}} Rosengart went on to note that the investigation into allegations of Jamie's financial mismanagement would continue and that he would likely be deposed by Rosengart.{{Cite web|first1=Lisa|last1=Respers France|first2=Chloe|last2=Melas|title=Jamie Spears says he intends to step down as conservator of Britney Spears|url=https://www.cnn.com/2021/08/12/entertainment/jamie-spears-britney-spears-conservartorship/index.html|access-date=2021-08-15|website=CNN}} Rosengart asserted that Jamie had "profited handsomely" from his daughter's estate, paying himself a percentage of her earnings.

On September 22, 2021, Rosengart filed a supplemental petition calling for the immediate resignation of Mr. Spears as the conservator of the estate, stating "While the entire conservatorship is promptly wound down and formally terminated, it is clear that Mr. Spears cannot be permitted to hold a position of control over his daughter for another day.” {{Cite news|last=Coscarelli|first=Joe|date=2021-09-22|title=Britney Spears: End Conservatorship, but Remove My Father First|language=en-US|work=The New York Times|url=https://www.nytimes.com/2021/09/22/arts/music/britney-spears-jamie-conservatorship.html|access-date=2021-09-23|issn=0362-4331}} Rosengart also requested a hearing on the continued mismanagement of Spears's estate by her father and the outstanding accounting and financial issues surrounding the conservatorship, citing “unwarranted commissions from his daughter’s work, totaling millions of dollars.” {{Cite news|agency=Associated Press|date=2021-09-22|title=In New Filing, Britney Spears Consents With The Petition To End Her Conservatorship|language=en|work=NPR|url=https://www.npr.org/2021/09/22/1039850881/britney-spears-jamie-spears-conservatorship|access-date=2021-09-23}}{{Cite web|last=Madani|first=Doha|title=Britney Spears' attorney pushes request to remove her father as conservator|url=https://www.nbcnews.com/pop-culture/pop-culture-news/britney-spears-attorney-pushes-ahead-request-remove-her-father-conservator-n1279866|access-date=2021-09-23|website=NBC News|language=en}}

On September 29, 2021, Judge Brenda Penny granted Rosengart's petition to suspend Jamie Spears immediately from his position as his daughter's conservator. Rosengart called the ruling, "a substantial step towards her freedom"{{Citation|last=America|first=Good Morning|title=Britney Spears' father suspended as conservator|url=https://www.goodmorningamerica.com/culture/video/britney-spears-father-suspended-conservator-80323256|language=en|access-date=2021-10-01}} and stated, "We achieved exactly what we sought out to achieve and that's justice." Rosengart asked the judge for an orderly transition and ultimately a termination of the conservatorship entirely.{{Cite web|title=Britney Spears scores major victory in her legal battle|url=https://www.today.com/video/britney-spears-scores-major-victory-in-her-legal-battle-122370117735|access-date=2021-10-01|website=TODAY.com|language=en}}{{Cite news|last1=Coscarelli|first1=Joe|last2=Jacobs|first2=Julia|last3=Day|first3=Liz|date=2021-09-29|title=Judge Frees Spears From Father's Control|language=en-US|work=The New York Times|url=https://www.nytimes.com/2021/09/29/arts/music/britney-spears-court-decision-conservatorship.html|access-date=2021-10-01|issn=0362-4331}} In a press conference following the decision Rosengart said, "There is definitely something to celebrate, but today is a solemn day. Britney Spears has been faced with a decade long nightmare, a Kafkaesque nightmare, orchestrated by her father and others and she's so thankful to all of you."{{Cite news|agency=Associated Press|date=2021-09-30|title=Video: 'A Great Day for Justice,' Britney Spears's Lawyer Says|language=en-US|work=The New York Times|url=https://www.nytimes.com/video/us/100000008000632/britney-spears-ruling-lawyer.html|access-date=2021-12-18|issn=0362-4331}}

On November 12, 2021, Judge Brenda Penny agreed with Rosengart's arguments and terminated the conservatorship. In a press briefing after the hearing, Rosengart stated, "What's next for Britney — and this is the first time this could be said for about a decade — is up to one person: Britney."{{Cite web|last=Whitten|first=Sarah|date=2021-11-12|title=Britney Spears freed from conservatorship after 13 years|url=https://www.cnbc.com/2021/11/12/britney-spears-freed-from-conservatorship-after-13-years.html|access-date=2021-12-05|website=CNBC|language=en}}{{Cite news|last=Steele|first=Anne|date=2021-11-12|title=Britney Spears Is Freed From Conservatorship|language=en-US|work=Wall Street Journal|url=https://www.wsj.com/articles/britney-spears-freed-from-conservatorship-11636756047|access-date=2021-12-05|issn=0099-9660}} When asked if Britney would perform again, he stated, “it’s up to her.” {{Cite news|last1=Coscarelli|first1=Joe|last2=Jacobs|first2=Julia|date=2021-11-13|title=Judge Ends Conservatorship Overseeing Britney Spears's Life and Finances|language=en-US|work=The New York Times|url=https://www.nytimes.com/2021/11/12/arts/music/britney-spears-conservatorship-ends.html|access-date=2021-12-05|issn=0362-4331}}

In 2023, Rosengart was noted as a "Key Figure" in Spears' book deal with Simon & Schuster reportedly valued around $15 Million.{{Cite news |last=Bernstein |first=Jacob |date=2023-10-31 |title=The Many People Behind ‘The Woman in Me’ |url=https://www.nytimes.com/2023/10/31/style/britney-spears-ghostwriters.html |access-date=2024-08-15 |work=The New York Times |language=en-US |issn=0362-4331}}{{Cite news |last=Jacobs |first=Julia |date=2023-11-02 |title=Britney Spears’s Memoir Sells 1.1 Million Copies in U.S. in First Week |url=https://www.nytimes.com/2023/11/01/arts/music/britney-spears-memoir-woman-in-me-sales.html |access-date=2024-08-15 |work=The New York Times |language=en-US |issn=0362-4331}} The Woman in Me became a New York Times #1 Bestseller.{{Cite news |last=Limbong |first=Andrew |date=October 18, 2023 |title=Britney Spears memoir reaches bestseller status a week before it hits shelves |url=https://www.npr.org/2023/10/18/1206783968/britney-spears-book-the-woman-in-me-hits-bestseller-status |access-date=August 15, 2024 |work=NPR}} In her memoir, Spears credited Rosengart for suspending her father as conservator, leading to the end of the conservatorship.{{Cite news |last=Greene |first=Jenna |date=October 27, 2023 |title=In Britney Spears’ new book, an unlikely hero – her lawyer |url=https://www.reuters.com/legal/litigation/column-britney-spears-new-book-an-unlikely-hero-her-lawyer-2023-10-27/#:~:text=Oct%2027%20(Reuters)%20%2D%20In,an%20unexpected%20hero%3A%20her%20lawyer. |access-date=August 15, 2024 |work=Reuters}}

On June 24, 2024 it was announced that Rosengart was parting ways with Spears after concluding the outstanding litigation on her behalf.{{Cite web |last=Gardner |first=Chris |date=2024-06-24 |title=Mathew Rosengart, Power Litigator Who Freed Britney Spears From Conservatorship, Closes Chapter of Representing Pop Superstar |url=https://www.hollywoodreporter.com/news/general-news/lawyer-mathew-rosengart-britney-spears-conservatorship-1235931256/ |access-date=2024-07-15 |website=The Hollywood Reporter |language=en-US}}{{Cite web |last=Wagmeister |first=Elizabeth |date=2024-06-24 |title=Britney Spears’ attorney Mathew Rosengart no longer representing singer after finalizing litigation for her conservatorship |url=https://www.cnn.com/2024/06/24/entertainment/britney-spears-mathew-rosengart/index.html |access-date=2024-07-15 |website=CNN |language=en}}{{Cite web |title=Britney Spears' Lawyer Parts Ways With Singer After Three Years |url=https://www.etonline.com/britney-spears-lawyer-mathew-rosengart-parts-ways-with-singer-after-three-years-227976 |access-date=2024-07-15 |website=Entertainment Tonight |language=en-US}}

In October 2021, Facebook hired Rosengart to represent the company.{{cite news |last1=Patten |first1=Dominic |title=Facebook Warns Anonymous Content Against "Recklessly" Proceeding With 'An Ugly Truth' TV Adaptation |url=https://deadline.com/2021/10/facebook-mark-zuckerberg-legal-letter-tv-adaptation-claire-foy-anonymous-content-1234861789/ |access-date=29 October 2021 |work=Deadline |date=25 October 2021}}{{cite news |last1=Dean |first1=Grace |title=Facebook has hired Britney Spears' lawyer ahead of an upcoming TV show about the tech giant, and will take legal action if the show contains 'false narratives,' it says |url=https://www.businessinsider.com/facebook-matthew-rosengart-britney-spears-lawyer-ugly-truth-doomsday-machine-2021-10 |access-date=29 October 2021 |work=Business Insider |date=26 October 2021}}

Rosengart has been featured on The Hollywood Reporter’s Power Lawyer list of the top 100 Hollywood attorneys from 2014-2017 and 2021-2023.{{Cite web |last1=Svetkey |first1=Benjamin |last2=Belloni |first2=Matt |date=2014-04-30 |title=Power Lawyers 2014: The Complete List A-Z |url=https://www.hollywoodreporter.com/business/business-news/power-lawyers-2014-complete-list-699971/ |access-date=2023-09-05 |website=The Hollywood Reporter |language=en-US}}{{Cite web |author=T. H. R. Staff |date=2015-04-15 |title=Power Lawyers 2015: Hollywood's Top 100 Attorneys Revealed |url=https://www.hollywoodreporter.com/lists/power-lawyers-2015-hollywoods-top-885693/ |access-date=2023-09-05 |website=The Hollywood Reporter |language=en-US}}{{Cite web |author=T. H. R. Staff |date=2016-04-20 |title=Power Lawyers 2016: Hollywood's Top 100 Attorneys |url=https://www.hollywoodreporter.com/lists/power-lawyers-2016-hollywoods-top-885270/ |access-date=2023-09-05 |website=The Hollywood Reporter |language=en-US}}{{Cite web |author=T. H. R. Staff |date=2017-04-26 |title=Power Lawyers 2017: Hollywood's Top 100 Attorneys |url=https://www.hollywoodreporter.com/lists/power-lawyers-2017-hollywoods-top-100-attorneys-997273/ |access-date=2023-09-05 |website=The Hollywood Reporter |language=en-US}}{{Cite web |last=Cullins |first=Ashley |date=2021-05-26 |title=Power Lawyers 2021: Hollywood's Top 100 Attorneys |url=https://www.hollywoodreporter.com/lists/hollywood-most-powerful-lawyers-2021/ |access-date=2023-09-05 |website=The Hollywood Reporter |language=en-US}}{{Cite web |last=Cullins |first=Ashley |date=2022-03-30 |title=Power Lawyers 2022: Hollywood's Top 100 Attorneys |url=https://www.hollywoodreporter.com/lists/hollywood-power-lawyers-2022-top-entertainment-attorneys/ |access-date=2023-09-05 |website=The Hollywood Reporter |language=en-US}}{{Cite web |last=Cullins |first=Ashley |date=2023-04-12 |title=Power Lawyers 2023: Hollywood's Top 100 Attorneys List |url=https://www.hollywoodreporter.com/lists/power-lawyers-2023-hollywoods-top-100-attorney-list/ |access-date=2023-09-05 |website=The Hollywood Reporter |language=en-US}} In 2021, Rosengart received the National Law Journal’s Sports, Gaming & Entertainment Law Trailblazer Award, he also received litigator of the week from The American Lawyer.{{Cite web |title=Britney Spears's Attorney Discusses Why Law Matters – Boston College Law School Magazine |url=https://lawmagazine.bc.edu/2022/03/rosengart-87-presents-deans-distinguished-lecture/ |access-date=2023-09-07 |language=en-US}}{{Cite web |title=Expert Perspectives on Biggest Court Cases |url=https://www.law.com/litigationdaily/2021/10/08/litigator-of-the-week-the-greenberg-traurig-lawyer-who-freed-britney/ |access-date=2023-09-11 |website=Litigation Daily {{!}} The American Lawyer |language=en}} In April 2022, Rosengart was presented with Variety's Power of Law award by his client Sean Penn.{{Cite web |last1=Urban |first1=Sasha |last2=Littleton |first2=Cynthia |date=2022-04-20 |title=Sean Penn Salutes Attorney Mathew Rosengart With Variety's Power of Law Award: 'He Still Practices His Dignity of Indignance' |url=https://variety.com/2022/biz/news/sean-penn-variety-power-of-law-mathew-rosengart-1235233223/ |access-date=2023-09-07 |website=Variety |language=en-US}}{{Cite web |last=Saval |first=Malina |date=2022-04-20 |title=Mathew Rosengart, Hollywood's King of Litigators, Talks Britney Spears Conservatorship, Early Legal Influences and Standing Up Against Bullies |url=https://variety.com/2022/legit/lawyers/mathew-rosengart-britney-spears-conservatorship-power-of-law-1235234940/ |access-date=2023-09-07 |website=Variety |language=en-US}} In September 2022, he was honored with the Excellence in Advocacy Award by the Beverly Hills Bar Association, and Law360 recognized him as Media & Entertainment MVP.{{Cite web |last=Caranicas |first=Peter |date=2022-08-26 |title=Beverly Hills Bar Association to Honor Litigator Mathew Rosengart and Judge David Cowan at 10th Annual Litigation Awards Dinner |url=https://variety.com/2022/awards/news/beverly-hills-bar-association-to-honor-litigator-mathew-rosengart-and-judge-david-cowan-at-10th-annual-litigation-awards-dinner-sean-penn-1235351520/ |access-date=2023-09-11 |website=Variety |language=en-US}}{{Cite web |last=Saval |first=Malina |date=2022-09-21 |title=Beverly Hills Bar Assn. Honors Two Legal Eagles: Mathew Rosengart and David Cowan |url=https://variety.com/2022/legit/awards/beverly-hills-bar-assn-honors-two-legal-eagles-mathew-rosengart-david-cowan-1235378617/ |access-date=2023-09-11 |website=Variety |language=en-US}}{{Cite web |title=MVP: Greenberg Traurig's Mathew S. Rosengart - Law360 |url=https://www.law360.com/articles/1529194/mvp-greenberg-traurig-s-mathew-s-rosengart |access-date=2023-09-12 |website=www.law360.com |language=en}} Rosengart was given the Praeses Elit Award by Trinity College of Dublin’s Law Society in 2022, other award recipients include Bob Geldof, F.W. de Klerk and Niall Horan.{{Cite web |title=Niall Horan Receives LawSoc's Praeses Elit Award |url=https://universitytimes.ie/2020/12/niall-horan-receives-lawsocs-praeses-elit-award/ |access-date=2023-09-12 |website=universitytimes.ie |language=en-US}} From 2021-2023, Rosengart was named a Leader of Influence by the LA Business Journal.{{Cite web |last=Garcia |first=Kelly |date=2023-08-07 |title=Leaders of Influence: Litigators & Trial Attorneys 2023 – Matthew Rosengart |url=https://labusinessjournal.com/custom-content/leaders-of-influence-litigators-trial-attorneys-2023-matthew-rosengart/ |access-date=2023-09-05 |website=Los Angeles Business Journal |language=en-US}}{{Cite web |title=Leaders of Influence: Litigators & Trial Attorneys 2022 |url=https://labusinessjournal.com/leaders-of-influence-litigators-trial-attorneys-2022/ |access-date=2023-09-11 |website=Los Angeles Business Journal |language=en-US}} Rosengart ranks among the top litigators in the U.S., having been recognized by The Best Lawyers in America in 2023 and 2024 for his work in Criminal Defense: White-Collar.{{Cite web |title=Mathew S. Rosengart - Los Angeles, CA - Lawyer |url=https://www.bestlawyers.com/lawyers/mathew-s-rosengart/148460 |access-date=2024-08-29 |website=Best Lawyers |language=en}} In 2024, Rosengart was listed as one of the Top 200 Lawyers in America by Forbes and named in Variety's Legal Impact Report for Hollywood's Top Entertainment Attorneys.{{Cite web |last=JACKSON" |first="LIANE |title=America's Top 200 Lawyers 2024 |url=https://www.forbes.com/lists/top-lawyers/ |access-date=2024-08-15 |website=Forbes |language=en}}{{Cite web |last=Wass |first=Dean Budnick, Paula Hendrickson, Karen Idelson, Todd Longwell, Robert Marich, Addie Morfoot, Bob Verini, Mike |last2=Budnick |first2=Dean |last3=Hendrickson |first3=Paula |last4=Idelson |first4=Karen |last5=Longwell |first5=Todd |last6=Marich |first6=Robert |last7=Morfoot |first7=Addie |last8=Verini |first8=Bob |last9=Wass |first9=Mike |date=2024-04-17 |title=Variety’s Legal Impact Report 2024: Meet Hollywood’s Top Entertainment Attorneys |url=https://variety.com/lists/legal-impact-report-2024-hollywood-top-attorneys/chris-spicer-marissa-roman-griffith-alissa-miller-vanessa-roman-4/ |access-date=2024-08-15 |website=Variety |language=en-US}}

Rosengart served as an adjunct professor of law at Fordham Law School teaching Criminal Procedure and presently serves on the board of governors of the Beverly Hills Bar Association and on the Dean's Advisory Council of Tulane University.{{Cite web|title=Leadership of the Beverly Hills Bar Association|url=https://bhba.org/leadership-of-the-beverly-hills-bar-association/|access-date=2021-08-15|website=Beverly Hills Bar Association|language=en-US}}{{Cite web|title=Mathew S. Rosengart Profile {{!}} New York, NY Lawyer {{!}} Martindale.com|url=https://www.martindale.com/attorney/mathew-s-rosengart-157462921/|access-date=2021-08-15|website=www.martindale.com}}

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Category:Living people

Category:Boston College Law School alumni

Category:United States attorneys

Category:Family law in the United States

Category:Year of birth missing (living people)