Bruce Hoffman is the Shelby Cullom and Kathryn W. Davis Senior Fellow for Counterterrorism and Homeland Security at the Council on Foreign Relations. He is also a professor at Georgetown University's Walsh School of Foreign Service; professor emeritus of terrorism studies at the University of St Andrews; and the George H. Gilmore Senior Fellow at the U.S. Military Academy's Combating Terrorism Center. His Columbia University Press books include Inside Terrorism (third edition, 2017). Jacob Ware is a research fellow at the Council on Foreign Relations and an adjunct professor at Georgetown University's Walsh School of Foreign Service and at DeSales University. He serves on the editorial boards for the academic journal Studies in Conflict & Terrorism and the Irregular Warfare Initiative at the Modern War Institute at West Point.