John B. Watson John Broadus Watson ( January 9 , 1878 -- September 25 , 1958 ) was an American psychologist who established the psychological school of behaviorism .
John B. Watson John Broadus Watson ( January 9 , 1878 -- September 25 , 1958 ) was an American psychologist . He established the psychological school of behaviorism , after doing research on animal behavior .