Bachelor of Science in Physics from MIT, 1971; Ph.D. in Astronomy from the University of Michigan, 1976; Research Scientist for SAS-3 X-ray satellite 1978-82 at Center for Space Research, MIT; Staff Scientist 1982-86 at Atmospheric and Environmental Research, Inc for solar heat flow variability; Scientist 1986 - present (2004) at Space Telescope Science Institute, where he is currently STScI Mission Scientist for James Webb Space Telescope; at the time of his selection assigned at Hale Observatories, Carnegie Institute of Washington, Pasadena, California; semi finalist in NASA astronaut group 8 and 9 selections; hobbies: flying, running, camping, and sea kayaking.