Professor of Geological Sciences

Professor of Planetary Science, Caltech & Director, Keck Institute for Space Studies

Professor of Geological Sciences, University of North Carolina, Chapel Hill

Australian National University

Senior Research Scientist, University of Colorado

Professor, Department of Earth Sciences, University of Oregon

Reseracher at Swedish Meteorological and Hydrological Institute

Scientist at Lamont-Doherty Earth Observatory (LDEO) of Columbia University

Professor, Dept. of Earth, Atmospheric, and Planetary Sciences, Purdue University

Massachusetts Institute of Technology