Senior Vice President and Director of Studies at the Migration Policy Institute, as well as Co-Director of MPI's National Center on Immigrant Integration Policy.My work focuses on immigrant integration, citizenship policy, immigrant children and families, the education of immigrant students, the effect of welfare reform on immigrants, and the impact of immigrants on the US labor force.Previously at the Urban Institute, where I directed the Immigration Studies Program (1998-2004). His research there focused on immigrants and integration, regulatory reform, federalism, race, and the measurement of discrimination.I am a Research Fellow with IZA in Bonn, Germany. Served on the National Academy of Sciences' Committee on the Redesign of US Naturalization Tests. In 2005, I was a New Millennium Distinguished Visiting Scholar at Columbia University's School of Social Work.My recent publications include "Still an Hourglass? Immigrant Workers in Middle-Skilled Jobs" (co-author), "Immigrants and Welfare" (editor), "Los Angeles on the Leading Edge: Immigrant Integration Indicators and Their Policy Implications," "Adult English Language Instruction in the United States: Determining Need and Investing Wisely," "Measures of Change: The Demography and Literacy of Adolescent English Learners," and "Securing the Future: US Immigrant Integration Policy, A Reader" (editor). Past research explored the implementation of employer sanctions and other reforms introduced by the 1986 Immigration Reform and Control Act.Received a JD from the University of Virginia and a bachelor of the arts degree from Princeton University. Additional graduate work at the London School of Economics.