G. Scott Hubbard is a physicist who has been engaged in space-related research as well as program, project and executive management for more than 45 years including 20 years with NASA, culminating as director of NASA's Ames Research Center. As of 2012, Hubbard chairs SpaceX Safety Advisory Panel, he previously served as the NASA representative on the Columbia Accident Investigation Board, was NASA's first Mars program director and restructured the Mars program in the wake of mission failures.