MARTA TIENDA is Maurice P. During ’22 professor in demographic studies and professor of sociology and public affairs at Princeton University and former director of the Office of Population Research. She has held appointments at the University of Chicago, where she served as chair of sociology, and the University of Wisconsin. She is a fellow of the American Academy of Arts and Sciences, the American Academy of Political and Social Sciences, and the American Association for the Advancement of Science, as well as past president of the Population Association of America. She serves as board member of the Federal Reserve Bank of New York, the Princeton Medical Center, the Sloan Foundation, the Jacobs Foundation of Switzerland, and the Corporation of Brown University. Her coauthored and coedited publications include The Hispanic Population of the United States (1987), Divided Opportunities (1988), The Color of Opportunity (2001), Youth in Cities (2002), and Ethnicity and Causal Mechanisms (2005). She has a Ph.D. in sociology from the University of Texas at Austin.