Associate Director & Regional Advisor for Europe at International Center for Law and Religion Studies

Research Associate at Pew Research Center

Professor of American Constitutionalism at Claremont McKenna College

Associate Professor of Political Science at Wellesley College

Professor of American Political Institutions at Claremont McKenna College

Assistant Professor, Political Science at University of Utah

Professor of Political Science, Department Deputy Chair at Columbia University

Senior Fellow at Migration Policy Institute

Director, National Center on Immigrant Integration Policy at Migration Policy Institute

Founding director | Latino Policy and Politics Initiative at UCLA

Ambassador at American Immigration Council

Senior Fellow & Director, MPI office at NYU School of Law at Migration Policy Institute

Immigration Justice Campaign Director at American Immigration Council

Ambassador at American Immigration Council

Professor | Department of History at UCLA

President at Migration Policy Institute

Astronomer at McDonald Observatory, University of Texas at Austin

Astronomy at McDonald Observatory, University of Texas at Austin

Professor, Arizona State University, School of Earth and Space Exploration in Phoenix, AZ

Member of the Board at Harvard Belfer Center for Science and International Affairs