WATSON, JOHN BROADUS ), American psychologist, was born at Greenville, S.C., on Jan. 9, 1878. He graduated at Furman university (M.A. 1900), continuing his studies at the University of Chicago (Ph.D. 1903). After serving as assistant and instructor in experimental psychology at the University of Chicago he was appointed professor of experimental and comparative psychology at Johns Hopkins university in 1908, being also director of the psychological laboratory there until 1920. Later he was a lecturer at the New School for Social Re search. He became known as the leading exponent of behaviour ism. (See BEHAVIOURISM.) In 1917 he served as major in the
aviation section of the Signal Corps, U.S. Reserves, and with the A.E.F. He was editor of The Psychological Review, 1908-15; he became joint editor of The Journal of Animal Behavior in 1910 and editor of The Journal of Experimental Psychology in 1915. He wrote Animal Education (1903) ; Behavior: An Introduction to Comparative Psychology (1914) ; Psychology from the Stand point of a Behaviorist (1919) ; and Behaviorism (1925) ; as well as many scientific monographs and articles.