Jonathan Caulkins is the H. Guyford Stever professor of operations research and professor of operations research and public policy at Carnegie Mellon University’s Qatar Campus and Heinz College. His work focuses on mathematical modeling and systems analysis of social policy problems, particularly issues pertaining to drugs, crime, violence, and crime prevention. He also works on software quality and optimal dynamic control applications in housing, counter-terror, and fashion. He is a past codirector of RAND’s Drug Policy Research Center and the founding director of RAND’s Pittsburgh office. He has a Ph.D. in operations research from Massachusetts Institute of Technology.

Susan E. Clarke is a professor of political science at the University of Colorado at Boulder, where she is also director of the Center to Advance Research and Teaching in the Social Sciences, a campus-wide interdisciplinary program. Her research interests include local economic development, cross-border regionalism, democratic inclusion processes, and policy development. She has a Ph.D. from the University of North Carolina at Chapel Hill.

Wayne A. Cornelius is a distinguished professor of political science and founding director of the Center for Comparative Immigration Studies at the University of California, San Diego (UCSD). At UCSD, he also holds the Gildred chair in U.S.-Mexican relations and was the founding director of the Center for U.S.-Mexican Studies. Formerly, he held positions at the Massachusetts Institute of Technology and Harvard and Princeton universities. His current research focuses on the outcomes of immigration control policies in the United States and Spain, a study of political incorporation among U.S.-based Mexican immigrants, and annual surveys of high-emigration communities in central and southern Mexico. He has a Ph.D. in political science from Stanford University.

Victoria A. Greenfield is the Crowe chair in the Defense Industrial Base Department of Economics at the U.S. Naval Academy. Previously, she held positions at the RAND Corporation; the President’s Council of Economic Advisers; the Bureau of Economic and Business Affairs at the U.S. Department of State; and Congressional Budget Office. Dr. Greenfield’s recent publications, including The World Heroin Market: Can Supply Be Cut? (2009, Oxford University Press), address international drug control policy and national security. She has a Ph.D. in agricultural and resource economics from the University of California, Berkeley.

John R. Hipp is an associate professor in the Department of Criminology, Law and Society at the University of California, Irvine. His research inter-

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