University Professor, University of California (1996-present)
Member, Emeritus Council, SETI Institute Board of Trustees
Member, National Academy of Sciences
President's Advisory Panel, National Academy of Sciences (1993 - present)
Committee on Astronomy and Astrophysics, National Academy of Sciences (1993 - 95)
Board of Directors, Annual Reviews (1988 - present)
California Council on Science and Technology (1988 - 94)
Board of Trustees, Carnegie Institution of Washington (1985 - present)
Co-Chair, Keck Observatory Science Steering Committee (1985 - 93)
Professor, Astronomy and Astrophysics, UC Santa Cruz (1972 - present)
Ph.D. in Astronomy, Harvard University
B.A. in Physics, Swarthmore College