(partial, representative listing)

Scientific Advisory Committee, Hayden Planetarium, Boston Museum of Science, 1975-82

Committee on Academic Studies, Harvard Astronomy Dept., 1975-78; Chairman, 1976-78

Committee on Public Education, Harvard-Smithsonian Center for Astrophysics, Chair, 1978-82

User's Committee, National Radio Astronomy Observatory, 1978-81

NASA Science Working Group on Extraterrestrial Intelligence, 1979-90

Bowdoin Prize (English Literature) Committee, Harvard University, 1979-82

Harlow Shapley Visiting Professor, American Astronomical Society, 1979-83

Science Advisor for PBS Television Series, "The Search for Solutions," 1980

Committee on Public Education and Information, American Institute of Physics, 1981-83

Editorial Advisory Board, Zygon: The Journal of Religion and Science, 1982-

Educational Advisory Committee, American Astronomical Society, 1985-89

Board of Editors, World Futures: The Journal of General Evolution, 1986-

National Academy of Sciences Panel, "Benefits to the Nation," 1988-90

National Science Foundation Advisory Committee, Educational Division, 1989

Contributing Editor, Air & Space Magazine, Smithsonian Institution, 1989-

Co-producer (with PBS's Maryland Public TV) "Starfinder" Television Series, 1990-91

Science Advisory Board, Merck Institute for Science Education, Merck & Company, 1992-98

Visiting Scholar and National Lecturer, Phi Beta Kappa, 1995-96

Board Member, Foundation For the Future, 1997-

Co-writer (with B. Silleck), "Cosmic Voyage," an IMAX educational production, 1996

Co-producer (with Jon Palfreman), "Cosmic Origins," an educational video, 2000

Board of Overseers, Boston Museum of Science, 2001-

Co-producer/writer (with Dana Berry), “The Arrow of Time,” an educational video, 2007