Julius Edgar Lilienfeld

Julius Edgar Lilienfeld
Lilienfeld, c. 1934
Born	(1882-04-18)April 18, 1882 Lemberg, Kingdom of Galicia and Lodomeria, Austria-Hungary
Died	August 28, 1963(1963-08-28) (aged 81) Saint Thomas, U.S. Virgin Islands
Citizenship	Austria-Hungary (1882–1919) Poland (1919–1934) United States (1934–1963)
Alma mater	University of Berlin (PhD)
Known for	Proposing the concept of the field-effect transistor
Spouse	Beatrice Ginsburg ​ (m. 1926)​
Scientific career
Fields	Physics
Institutions	Leipzig University (1905–1926)
Doctoral advisor	Max Planck Emil Warburg
Other academic advisors	Jacobus Henricus van 't Hoff
Signature

Julius Edgar Lilienfeld (April 18, 1882 – August 28, 1963) was an American electrical engineer and physicist who has been credited with the first patent on the field-effect transistor in 1925. He was never able to build a working practical semiconductor device based on his concept. Additionally, because he didn't publish articles in learned journals and since high-purity semiconductor materials were not available to him, his FET patent never achieved fame, causing confusion for later inventors.^[1]