**Gary King *is the Albert J. Weatherhead III University Professor at Harvard University. His books include A Solution to the Ecological Inference Problem (Princeton).Robert O. Keohaneis professor emeritus of international affairs at Princeton University. His books include After Hegemony (Princeton)...

**Gary King *is the Albert J. Weatherhead III University Professor at Harvard University. His books include A Solution to the Ecological Inference Problem (Princeton).Robert O. Keohaneis professor emeritus of international affairs at Princeton University. His books include After Hegemony (Princeton).Sidney Verba(1932-2019) was the Carl H. Pforzheimer University Professor Emeritus and research professor of government at Harvard. His books include Unequal and Unrepresented * (Princeton). King, Keohane, and Verba have each been elected as members of the National Academy of Sciences.