Clark McCauley is a research professor of psychology at Bryn Mawr university and Co-Director of the Solomon Asch Center for the Study of Ethnopolitical Conflict at Bryn Mawr College. He received his Ph.D. in social psychology from the University of Pennsylvania in 1970. With Dan Chirot, he co-authored Why Not Kill Them All? The Logic and Prevention of Mass Political Murder, published by Princeton University Press in 2006. He is the founding editor of the journal Dynamics of Asymmetric Conflict: Pathways toward Terrorism and Genocide.

Sophia Moskalenko is a Postdoctoral Research Fellow at the National Consortium for the Study of Terrorism and Responses to Terrorism (NC-START) and a consultant with the Oak Ridge National Laboratory in Oak Ridge, Tennessee. She received her Ph.D. in social psychology from the University of Pennsylvania in 2004. Her research and publications have focused on group identification, political activism, radicalization, and terrorism.