David A. Lake is Research Director for International Relations at the Institute on Global Conflict and Cooperation, and Professor of Political Science at the University of California, San Diego. He is the author of Entangling Relations (Princeton). Robert Powell is Robson Professor of Political Science at the University of California, Berkeley. He has written widely on the application of game theory to issues in strategic studies and international relations theory. He is the author of Nuclear DeterrenceTheory: The Search for Credibility and In the Shadow of Power.