Edward D. Mansfield is Hum Rosen Professor of Political Science at the University of Pennsylvania. He is the author of Power, Trade, and War and International Conflict and the Global Economy.

Jack Snyder is the Robert and Renée Belfer Professor of International Relations at Columbia University. He is the author of From Voting to Violence: Democratization and Nationalist Conflict; Myths of Empire: Domestic Politics and International Ambition; and The Ideology of the Offensive: Military Decision Making and the Disasters of 1914.