EDWARD C. STONE is the David Morrisroe Professor of Physics and vice provost for special projects at the California Institute of Technology (Caltech) and a former director of the Jet Propulsion Laboratory. Since 1972, Dr. Stone has served as the Voyager chief scientist in the exploration of Jupiter, Saturn, Uranus, and Neptune and continues to lead the study of the outer heliosphere as the two Voyager spacecraft continue their journey to interstellar space. He has also had oversight of the construction and operation of the two 10-meter W.M. Keck telescopes on Mauna Kea, Hawaii, and of the design development of the 30-Meter Telescope. Dr. Stone is a member of the National Academy of Sciences and the American Philosophical Society, president of the International Academy of Astronautics (IAA), a vice president of COSPAR, and on the board of the W.M. Keck Foundation. Among his scientific awards and honors, he has received the National Medal of Science (1991), the Magellanic Award from the American Philosophical Society, the IAF Alan D. Emil Award, the IAA von Karman Award, and three NASA Distinguished Service Medals. In 1996, Asteroid 5481 was named after him.