Former Director, Carl Sagan Center for the Study of Life in the Universe

Former Chairman, SETI Institute Board of Trustees

Professor, Astronomy and Astrophysics (1984 - 1996), Professor Emeritus (1996 - present), and Dean, Natural Sciences (1984 - 88), UC Santa Cruz

Member, National Academy of Sciences

Chairman, Board of Physics and Astronomy, National Research Council (1989 - 92)

President, Astronomical Society of the Pacific (1988 - 90)

Director, National Astronomy and Ionosphere Center (1970 - 81)

Professor of Astronomy, Cornell University (1964 - 84)

M.S. and Ph.D. in Astronomy from Harvard University

B.A. in Engineering Physics, Cornell University