found:SSDI, viewed Oct. 21, 2006(Leon Festinger; birth May 8, 1919; death Feb. 11, 1989)
found:WIkipedia, via WWW, January 20, 2022(Leon Festinger; born in Brooklyn; American social psychologist; worked as a research associate at the University of Iowa, then as a statistician for the Committee on Selection and Training of Aircraft Pilots at the University of Rochester during World War II; joined the Research Center for Group Dynamics at the Massachusetts Institute of Technology as an assistant professor; worked at several universities, including the University of Michigan, the University of Minnesota, and Stanford University)