Mary C. Waters is M.E. Zukerman Professor of Sociology at Harvard University. She is author most recently of The Next Generation: Immigrant Youth in Comparative Perspective, and of Ethnic Options: Choosing Identities in America (UC Press), among other books. Patrick J. Carr is Associate Professor at Rutgers University. He is the author of Clean Streets: Controlling Crimes, Maintaining Order, and ... Read moreBuilding Community Activism and Hollowing 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 of Promises 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 of Environment and Health in China: Cross-disciplinary Perspectives. Show Less