Michael W. Doyle is professor of politics and international affairs at Princeton University. G. John Ikenberry is codirector of the Lauder Institute of Management and International Studies and associate professor of political science at the University of Pennsylvania. Michael W. Doyle is professor of politics and international affairs at Princeton University. G. John Ikenberry is codirector of the Lauder Institute of Management and International Studies and associate professor of political science at the University of Pennsylvania. Michael W. Doyle is professor of politics and international affairs at Princeton University. G. John Ikenberry is codirector of the Lauder Institute of Management and International Studies and associate professor of political science at the University of Pennsylvania.