Louis William Stern

William Stern (German: [ʃtɛɐ̯n]; 29 April 1871 – 27 March 1938), born Louis William Stern, was a German psychologist and philosopher noted as a pioneer in the field of the psychology of personality and intelligence. He coined the term intelligence quotient, or IQ, later used by Lewis Terman and other researchers in the development of the first IQ tests, based on the work of Alfred Binet. He was the father of the German writer and philosopher Günther Anders. In 1897, Stern invented the tone variator, allowing him to research human perception of sound in an unprecedented way.

Stern was born in Berlin, the grandson of the German-Jewish reform philosopher Sigismund Stern (1812-1867). He received his PhD in psychology from the University of Berlin, where he studied under Hermann Ebbinghaus in 1893. He taught at the University of Breslau from 1897 to 1916. In 1916, he was appointed Professor of Psychology at University of Hamburg, where he remained until 1933 as Director of the Psychologic Institute. Stern, a Jew, was ousted by Hitler's regime after the rise of Nazi power. He emigrated first to the Netherlands in 1933, before fleeing to the United States, where he was appointed Lecturer and Professor at Duke University. He taught at Duke until his death from a heart attack in 1938.

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