Audrey Kurth Cronin is professor of strategy at the U.S. National War College in Washington, DC, and senior associate in the Changing Character of War program at the University of Oxford. She is the author of "Ending Terrorism: Lessons for Defeating al-Qaeda" and the coauthor of "Attacking Terrorism: Elements of a Grand Strategy".
James M. Ludes is former editor-in-chief of *National Security Studies Quarterly*, and coeditor of *Twenty-First Century Weapons Proliferation: Are We Ready?*
Michael Sheehan is Professor of International Relations at Swansea University, UK.