Roger is an astronomer and astrophysicist. He is a Fellow of the Royal Society, Member of the U.S. National Academy of Science, and Fellow of the American Academy of Arts and Sciences. He is the Luke Blossom Professor in the School of Humanities and Sciences at Stanford University, the Pehong and Adele Chen Director of Particle Astrophysics and Cosmology and Professor of Physics and SLAC National Accelerator Lab. Previously he served as Director of the Lockheed Martin Space Exploration Systems, responsible for development and flight operations of the company’s spacecraft. He also served as Program Manager for development of the Mars Odyssey Spacecraft and Cassini Spacecraft Propulsion Modules.