Edward C. Stone, Voyager Chief Scientist, Jet Propulsion Laboratory (JPL) Pasadena, California. Ed Stone demonstrates one of his greatest skills: explaining. Taken during the Voyager 2 encounter with Neptune, August 25, 1989 and a spell-binding five hours later: Triton, the last solid body the spacecraft would have the opportunity to visit. Dr. Stone went on to become the director of the lab.