MARY C. WATERS is the John L. Loeb Professor of Sociology at Harvard University, where she has taught since 1986. A sociologist and demographer, her work has focused on the integration of immigrants and their children, the social determinants of health, immigration policy, disasters and their aftermath, and the measurement and meaning of racial and ethnic identity. Her current projects include a study of older Latino immigrants and the American welfare state, and a longitudinal study of mobility and recovery among survivors of Hurricane Katrina (the RISK project), as well as work on climate change and migration. She is an elected member of the American Academy of Arts and Sciences, the American Philosophical Society, and the National Academy of Sciences.