Richard Ned Lebow is James O. Freedman Presidential Professor of Government at Dartmouth College and author of The Tragic Vision of Politics: Ethics, Interests and Orders, which won the Alexander L. George Award for the best book in political psychology. Geoffrey Parker is Andreas Dorpalen Professor of History at Ohio State University, a Fellow of the British Academy, and author of The Military Revolution: Military Innovation and the Rise of the West, 1500-1800, winner of two book prizes. Philip E. Tetlock is Professor of Organizational Behavior at the University of California, Berkeley, and author of Expert Political Judgment: How Good Is It? How Can We Know?