David Ryan is Professor and Chair of Modern History at University College Cork, Ireland. He is the author of US Foreign Policy in World History (2000) and Frustrated Empire:US Foreign Policy, 9/11 to Iraq (2007), and he has co-edited Vietnam in Iraq: Tactics, Lessons, Legacies and Ghosts (2007, with John Dumbrell) and America and Iraq: Policy-Making, Intervention, and Regional Politics (2009, with Patrick Kiely).