Professor emeritus of the Department of Policy Analysis and Management in the College of Human Ecology. Hahn received his bachelor's degree in sociology, master's in government and doctorate in political science, all from Indiana University in Bloomington. He taught in the area of public policy education in the Department of Consumer Economics and Housing in Cornell's College of Human Ecology from 1969 to 1976 and then the college's Department of Human Service Studies until he retired in 1996.