He was employed by the Jet Propulsion Laboratory from 1985 to 1990 as an orbital analyst on such missions as Galileo, Magellan, Cassini, Ulysses, Mars Observer, and others.
Von 1985 bis 1990 arbeitete er als „Orbital Analyst“ für das Jet Propulsion Laboratory (JPL) an Missionen wie beispielsweise Galileo, Magellan, Cassini, Ulysses, Mars Observer.