"ISIS: The State of Terror"

J. M. Berger is a nonresident fellow with the Brookings Institution. Author of "Jihad Joe: Americans Who Go to War in the Name of Islam," a critically acclaimed history of the American jihadist movement. He is a regular contributor to Foreign Policy magazine. Co-Author of "ISIS: The State of Terror" J.M. Berger. An expert on violent extremism and terrorism. Mr. Berger help us understand the origins and evolution of ISIS.