Leon Festinger (8 May 1919 -11 February 1989) was an American social psychologist, perhaps best known for cognitive dissonance and social comparison theory.
Henry William Riecken (November 11, 1917 - December 27, 2012) was an American psychologist.
Stanley Schachter (April 15, 1922 - June 7, 1997) was an American social psychologist, who is perhaps best known for his development of the two factor theory of emotion in 1962 along with Jerome E. Singer.