Mary C. Waters is M.E. Zukerman Professor of Sociology at Harvard University. She is author most recently ofThe Next Generation: Immigrant Youth in Comparative Perspective,and ofEthnic Options: Choosing Identities in America(UC Press), among other books. Patrick J. Carr is Associate Professor at Rutgers University. He is the author ofClean Streets: Controlling Crimes, Maintaining Order, and Building Community ActivismandHollowing Out the Middle: The Rural Brain Drain and What it Means for America.Maria J. Kefalas, Professor in the Department of Sociology at Saint Joseph's University, is the author ofPromises I Can Keep: Why Poor Women Put Motherhood Before Marriage(UC Press) among other… books. Jennifer Holdaway is Program Director and China Representative at the Social Science Research Council. She is the author most recently ofEnvironment and Health in China: Cross-disciplinary Perspectives.