University Professor of Astronomy and Astrophysics Astronomer, UC Observatories/Lick Observatory (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