Clark McCauley is professor of psychology and co-director of the Solomon Asch Center for Study of Ethnopolitical Conflict at Bryn Mawr College. His research interests include stereotypes, group identification, group dynamics, and intergroup conflict. In recent years he has focused on the psychological foundations of ethnic conflict, genocide, and terrorism. He is a lead investigator of a number of projects for the National Consortium for Study of Terrorism and Responses to Terrorism (NC-START). With Dan Chirot he is author of Why Not Kill Them All? The Logic and Prevention of Mass Political Murder, and with Sophia Moskalenko he is author of Friction: How Radicalization Happens to Them and Us. He is a consultant and reviewer for the Harry Frank Guggenheim Foundation for research on dominance, aggression and violence, and emeritus founding editor of the journal Dynamics of Asymmetric Conflict. He received his B.A. in biology from Providence College and his Ph.D. in social psychology from the University of Pennsylvania.