Pitirim Alexandrovich Sorokin was a Russian American sociologist and political activist, who contributed to the social cycle theory. Wikipedia
Born: January 21, 1889, Knyazhpogostsky District, Russia
Died: February 10, 1968 (age 79 years), Winchester, MA
Education: Saint Petersburg State University
Children: Peter Sorokin and Sergei Sorokin
Organization founded: International Society for the Comparative Study of Civilizations