Chief Scientist – NASA George C. Marshall Space Flight Center
Astrobiologist
Planetary Geophysicist – NASA’s Jet Propulsion Laboratory (JPL)
Scientist – NASA Jet Propulsion Laboratory
Co-Investigator for the New Horizons Mission – Boulder
Senior Research Scientist – University of Texas at Austin
Program Executive (Retired) – NASA Headquarters
Former Director for Solar System Exploration – Jet Propulsion Laboratory
Project Manager – Jet Propulsion Laboratory
Project Manager – Marshall Space Flight Center
