Professor of Astrophysics and International Affairs at Princeton University
Co-Director of the Program on Science and Global Security at the Woodrow Wilson School of Public and International Affairs
Member, SETI Institute Board of Trustees, 2005 - 2007
Former SETI Institute Carl Sagan Chair for the Study of Life in the Universe, 1998 - 2005
Former Director, SETI Institute Center for the Study of Life in the Universe, 1998 - 2004
Chair, Committee on Preventing the Forward Contamination of Mars for the National Research Council (NRC) of the National Academies
Former Associate Professor of Geological and Environmental Sciences, Stanford University and Co-Director of the Center for International Security and Cooperation (CISAC) at Stanford
Named MacArthur Fellow in October, 2001
1996 Recipient of the Presidential Early Career Award