was involved in the Lunar Ranger and Surveyor programs and continued with the crewed Apollo programs.!He culminated his lunar studies in 1994 with new data on the Moon from Project Clementine, for which he was the science-team leader. He collaborated closely with his wife, Carolyn, a planetary astronomer. The impact of Comet Shoemaker-Levy into Jupiter in 1994 was widely publicized.

Starting in 1963, the Astrogeology Science Center played an important role in training astronauts destined to