Astronomy at McDonald Observatory, University of Texas at Austin

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

Astronomer at McDonald Observatory, University of Texas at Austin

Astronomer at McDonald Observatory, University of Texas at Austin

Astronomer at McDonald Observatory, University of Texas at Austin

Astronomer, Research Associate at McDonald Observatory, University of Texas at Austin

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

President Emeritus & Senior Fellow, Inter-American Dialogue at Inter-American Dialogue

Policy Analyst in San José, SJ

President, Inter-American Dialogue at Inter-American Dialogue

Assistant Professor of Politics and International Affairs at Princeton University

Assistant Professor of Political Science at Wellesley College

Visiting Scholar in International and Public Affairs at Brown University, Watson Institute for International and Public Affairs

Principal at Farr Marketing Group in Los Angeles, CA

Professor of Law at Duke University

Professor of Law at Stanford Law School in Stanford, CA

Counsel for Civil Justice and Consumer Rights at Public Citizen

Deputy Legal Director and Director of the Trone Center for Justice and Equality at American Civil Liberties Union (ACLU)

Professor of Psychology at Scripps College in Los Angeles, CA