One of the nation’s leading specialists on jihadism, Barak Mendelsohn takes an unconventional approach to the subject in his new book, arguing that while jihadi terrorism is a serious challenge, the threat it poses should not be exaggerated. Transational jihadism, as represented by groups like Al Qaeda and ISIS, faces it own internal constraints, particularly because most of the world’s peoples, including most of the Islamic world’s peoples, possess national identities that are even stronger than religious identities. Added to that is frequent infighting over strategy and tactics. In other words, transnational movements are far less unified than they may appear. Mendelsohn will offer a sophisticated analysis of the terrorist threat and the implications for US counterterrorism policies.