Julius Edgar Lilienfeld

J. E. Lilienfeld
Lilienfeld at age 53
Born	(1882-04-18)April 18, 1882 Lemberg, Galicia, Austro-Hungarian Empire
Died	August 28, 1963(1963-08-28) (aged 81) Charlotte Amalie, Virgin Islands, U.S.
Citizenship	Austro-Hungarian (1882 – September 1919) Polish (1919–1934) American (1934–1963)
Alma mater	Friedrich-Wilhelms-Universität
Known for	Field-effect transistor Electrolytic capacitor
Scientific career
Fields	Physicist Electrical engineer
Institutions	Leipzig University Amrad, Inc Ergon Research Laboratories
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 Austro-Hungarian-American physicist and electrical engineer, who has been credited with the first patent on the field-effect transistor (FET) (1925). He was never able to build a working practical semiconducting device based on this concept. Additionally, because of his failure to 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]