Astronomer at McDonald Observatory, University of Texas at Austin

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

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

Astronomy at McDonald Observatory, University of Texas at Austin

Co-Director Nuclear Policy Program at Carnegie Endowment for International Peace

Senior fellow in Carnegie’s Asia Program at Carnegie Endowment for International Peace

Co-director and a senior fellow of the Nuclear Policy Program at Carnegie Endowment for International Peace

Director of the Korean Studies Institute at USC Dornsife College

Director, Program in Politics and Law at Dartmouth College

Chair of Political Science at Brown University, Watson Institute for International and Public Affairs

Professor at Emory University

Senior Fellow at Center for a New American Security