
Planetary Geophysicist - NASA's Jet Propulsion Laboratory (JPL)

Co-Investigator for the New Horizons Mission - Boulder

Scientist - NASA Jet Propulsion Laboratory

Program Executive (Retired) - NASA Headquarters

Senior Research Scientist - University of Texas at Austin

Former Director for Solar System Exploration - Jet Propulsion Laboratory

Project Manager - Jet Propulsion Laboratory

Project Manager - Marshall Space Flight Center

Engineering Camera Payload Uplink Lead

Chief Astronomer and NASA Solar System Ambassador - The Franklin Institute Science Museum