Ronald Breiger is an American sociologist and a Regents Professor, a professor of sociology and (by courtesy) government and public policy, an affiliate of the interdisciplinary graduate program in statistics and data science, and an affiliate of the interdisciplinary graduate program in applied mathematics at the University of Arizona. Prior to coming to Arizona he served on the faculties of Harvard University (assistant to associate professor) and Cornell University (professor to Goldwin Smith Professor of Sociology). He is well cited in the fields of social networks, social stratification, mathematical sociology, organizational sociology and cultural sociology and, with Linton Freeman, edited the influential academic journal Social Networks from 1998 to 2006. In 2005 he was the recipien