Daniel Byman is a professor at Georgetown University and a senior fellow at Brookings. He is a widely published and nationally recognized expert on terrorism. Byman was a US government analyst and a staff member on the 9/11 Commission, among other positions. His most recent books include A High Price: The Triumphs and Failures of Israeli Counterterrorism; Al Qaeda, the Islamic State, and the Global Jihadist Movement and Road Warriors: Foreign Fighters in the Armies of Jihad.