Scientist - Johns Hopkins University Applied Physics Laboratory
Scientist - Planetary Science Institute
Research Scientist - SETI Institute and NASA Ames Research Center
Planetary Scientist - Jet Propulsion Laboratory
Research Astrophysicist - Goddard Space Flight Center
Research Scientist - NASA Ames Research Center
Director - Marshall Space Flight Center
Director, Department of Sensor Systems and Nondestructive Evaluation - Southwest Research Institute
Geologist - Jet Propulsion Laboratory
