History Professor at the University of South Carolina in Irmo, SC

National Security Professor at University of New Haven

Associate Director of Global Attitudes Research at Pew Research Center

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

Senior Fellow, Atlantic Council’s Europe Center in Washington, DC

Professor of Government at Claremont McKenna College

International Relations Professor & Director, Liechtenstein Institute on Self-Determination at Princeton University

Distinguished Service Professor of Public Policy and Head of Heinz College in Washington, DC at Carnegie Mellon University Heinz College

Astronomy 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

Astronomer at McDonald Observatory, University of Texas at Austin

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

Astronomy 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

Director of Energy Research & Analysis at Union of Concerned Scientists

Global Director, Energy at World Resources Institute

Faculty Affiliate, Harvard Project on Climate Agreements at Harvard Belfer Center for Science and International Affairs