Johannes Stark

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Johannes Stark
Stark in 1919
Born	(1874-04-15)15 April 1874 Schickenhof, German Empire
Died	21 June 1957(1957-06-21) (aged 83) Traunstein, West Germany
Nationality	German
Alma mater	University of Munich
Known for	Stark effect
Awards	Matteucci Medal (1915) Nobel Prize in Physics (1919)
Scientific career
Fields	Physics
Institutions	University of Göttingen Technische Hochschule, Hannover Technische Hochschule, Aachen University of Greifswald University of Würzburg
Doctoral advisor	Eugen von Lommel

Johannes Stark (German pronunciation: [joˈhanəs ʃtaʁk] ^ⓘ, 15 April 1874 – 21 June 1957) was a German physicist who was awarded the Nobel Prize in Physics in 1919 "for his discovery of the Doppler effect in canal rays and the splitting of spectral lines in electric fields". This phenomenon is known as the Stark effect.

Stark received his Ph.D. in physics from the University of Munich in 1897 under the supervision of Eugen von Lommel, and served as Lommel's assistant until his appointment as a lecturer at the University of Göttingen in 1900. He was an extraordinary professor at Leibniz University Hannover from 1906 until he became a professor at RWTH Aachen University in 1909. In 1917, he became professor at the University of Greifswald, and he also worked at the University of Würzburg from 1920 to 1922.

A supporter of Adolf Hitler from 1924, Stark was one of the main figures, along with fellow Nobel laureate Philipp Lenard, in the anti-Semitic Deutsche Physik movement, which sought to remove Jewish scientists from German physics. He was appointed head of the German Research Foundation in 1933 and was president of the Reich Physical-Technical Institute from 1933 to 1939. In 1947 he was found guilty as a "Major Offender" by a denazification court.