J.M. Berger is internationally known as an expert on extremism and terrorism. He is the author of three nonfiction books, including Extremism (2018), ISIS: The State of Terror with Jessica Stern (2015) and Jihad Joe: Americans Who Go to War in the Name of Islam (2011). He has written for The Atlantic, Politico, and The Boston Globe, among others. Berger is a Senior Research Fellow for the Center on Terrorism, Extremism, and Counterterrorism (CTEC) at the Middlebury Institute of International Studies, and a member of the editorial board of Terrorism and Political Violence. In addition to writing fiction, he enjoys spending time with trees and water.