Fritz Reiche

{{short description|German physicist}}

{{Infobox person

| name = Fritz Reiche

| image =

| alt =

| caption =

| birth_name =

| birth_date = {{Birth date|1883|07|04|mf=y}}

| birth_place = Berlin, Germany

| death_date = {{Death date and age|1969|01|14|1883|07|04|mf=y}}

| death_place =

| nationality = German

| other_names =

| occupation = physicist, professor

| years_active = 1913–1969

| education = University of Munich,
University of Berlin

| known_for = quantum mechanics,
supersonic flow

| notable_works = The Quantum Theory

}}

Fritz Reiche (July 4, 1883 – January 14, 1969) was a German physicist, a student of Max Planck and a colleague of Albert Einstein, who was active in, and made important contributions to the early development of quantum mechanics including co-authoring the Thomas-Reiche-Kuhn sum rule.{{cite journal|title=Fritz Reiche and German Refugee Scientists|last=Bederson|first=Benjamin|date=April 5, 2003|journal=Speech Before American Physical Society, April Meeting, 2003|volume=2003|pages=H8.004|bibcode=2003APS..APR.H8004B}}

Fritz Reiche was born in 1883 in Berlin, Germany. In 1901 and 1902, he attended the University of Munich and he attended the University of Berlin from 1902 to 1907, where he received his PhD. From 1913 to 1920 as privatdozent he worked and taught under Planck in Berlin.{{cite journal|title=Fritz Reiche Dies; Was Theoretical Physicist|journal=Physics Today|date=March 1969|volume=22|issue=3|pages=119|doi=10.1063/1.3035448|doi-access=free}} Reiche published more than 55 scientific papers and books including The Quantum Theory.{{cite journal|author=Stone, M. H.|authorlink=Marshall Harvey Stone|title=Review: The Quantum Theory by Fritz Reiche; trans. by H. S. Hatfield and Henry L. Brose|journal=Bull. Amer. Math. Soc.|year=1933|volume=39|issue=11|pages=856–857|url=https://www.ams.org/journals/bull/1933-39-11/S0002-9904-1933-05747-6/S0002-9904-1933-05747-6.pdf|doi=10.1090/S0002-9904-1933-05747-6|doi-access=free}}{{cite journal|author=Phillips, H. B.|title=Review: Die Quantentheorie, ihr Ursprung und ihre Entwicklung by Fritz Reiche|journal=Bull. Amer. Math. Soc.|year=1922|volume=28|issue=1|pages=69–70|url=https://www.ams.org/journals/bull/1922-28-01/S0002-9904-1922-03526-4/S0002-9904-1922-03526-4.pdf|doi=10.1090/s0002-9904-1922-03526-4|doi-access=free}}

He became a professor in 1921 at the University of Breslau and then was dismissed as a Jew from his academic position in 1933. Eventually, with the help of Ladenburg, Einstein, and the Emergency Committee in Aid of Displaced Foreign Scholars,{{Cite web |url=http://www.aip.org/history/ohilist/4841_1.html |title=Oral History Transcript — Dr. Fritz Reiche, aip.org |access-date=2015-03-20 |archive-date=2015-04-02 |archive-url=https://web.archive.org/web/20150402155718/http://www.aip.org/history/ohilist/4841_1.html |url-status=dead }}{{citation

| last = Bederson | first = Benjamin

| date = December 2005

| doi = 10.1007/s00016-005-0245-3

| issue = 4

| journal = Physics in Perspective

| pages = 453–472

| title = Fritz Reiche and the Emergency Committee in Aid of Displaced Foreign Scholars

| volume = 7|bibcode = 2005PhP.....7..453B | s2cid = 121348637

}} Reiche emigrated with his family to the United States in 1941 and went on to work with NASA and the United States Navy on projects related to supersonic flow.{{cite web|url=http://aip.org/history/ead/20020127_content.html|title=Finding Aid to the Fritz Reiche Papers, 1907-1998|publisher=American Institute of Physics|accessdate=12 February 2010|archive-url=https://web.archive.org/web/20110604144604/http://www.aip.org/history/ead/20020127_content.html|archive-date=4 June 2011|url-status=dead}}