Robert Ezra Park (February 14, 1864 – February 7, 1944) was an American urban sociologist who is considered to be one of the most influential figures in early U.S. sociology. From 1905 to 1914 Park worked with Booker T. Washington at the Tuskegee Institute. After Tuskegee, he taught at the University of Chicago, from 1914 to 1933, where he played a leading role in the development of the Chicago School of sociology. Park is noted for his work in human ecology, race relations, migration, assimilation, social movements, and social disorganization.
Ernest Watson Burgess (May 16, 1886 – December 27, 1966) was a Canadian urban sociologist born in Tilbury, Ontario. He was educated at Kingfisher College in Oklahoma and continued graduate studies in sociology at the University of Chicago. In 1916, he returned to the University of Chicago, as a faculty member. Burgess was hired as an urban sociologistat the University of Chicago. Burgess also served as the 24th President of the American Sociological Association (ASA).