Prize

•   2003 Education Prize of the American Astronomical Society

Honorary membership

•   Royal Astronomical Society of Canada, 2003

Officer and committee member

•   U.S. National Representative to Commission 46 (The Teaching of Astronomy) of the International Astronomical Union (1979–2000)

•   American Association for the Advancement of Science (Chairperson-elect, Section D—Astronomy, 1986–87, Chairperson, 1987–1988, Retiring Chairperson, 1988–1989); 1996-1997, Chair-Elect, 1997–1998, Chair, 1998–-1999, Retiring Chair

•   American Association of Physics Teachers (Astronomy Education Committee, 1983–1987)

•   American Astronomical Society, Astronomy Education Advisory Committee (1990–1997); Astronomy News Committee (1991–1996); Working Group on Astronomy Education Organizing Committee, 1991–1997)

•   NASA Astrophysics Council (1990–1992)

•   I.A.U. Representative to the International Council of Scientific Unions--Committee on Teaching of Science, 1991–1994

•   American Physical Society (AAPT/APS Member-at-large, Forum on Education, 1995–1997)

•   U.S.National Liaison to Commission 46 (Astronomy Education and Development) of the I.A.U. (2000–); Vice-President, 2000–2003, President, 2003–2006

Member

•   International Astronomical Union

•   American Astronomical Society

•   American Physical Society (Fellow, 1987–)

•   Royal Astronomical Society (Fellow)

•   New York Academy of Sciences (Fellow)

•   Sigma Xi (President, Williams College Club, 1973–74,1996–)

•   International Planetarium Society (Fellow, 1992–)

•   Astronomical Society of the Pacific

•   International Union of Radio Science (URSI) Commission on Radio and Radar Astronomy

•   American Association for the Advancement of Science (Fellow, 1984–)

•   American Association of Physics Teachers

•   Committee on Scientific Inquiry (Fellow, 2010—)

International Astronomical Union

General Assemblies Attended

•   Hamburg 1964

•   Prague 1967

•   Brighton 1970

•   Sydney 1973

•   Grenoble 1976

•   Montreal 1979

•   Patras 1982

•   Baltimore 1988

•   Buenos Aires 1991

•   The Hague 1994

•   Kyoto 1997

•   Manchester 2000

•   Sydney 2003

•   2006 Prague

•   2009 Rio de Janeiro

I.A.U. Commissions

•   U.S. National Representative to Commission 46 (The Teaching of Astronomy), 1979–2000; U.S. National Liaison, 2000–

•   Chairman, Local Organizing Committee for IAU Colloquium #105 on the Teaching of Astronomy, and member of Scientific Organizing Committee, Williams College, July 1987, and coeditor of Proceedings (Cambridge Univ. Press)

•   Chair, Working Group on Eclipses of Commissions 10 and 12 on the Solar Atmosphere, 1991–

•   Scientific Organizing Committee for Commission 46 at General Assembles at Buenos Aires, 1991; The Hague, 1994; Kyoto, 1997; Manchester, 2000; Sydney, 2003; Prague, 2006

•   1994 I.A.U. Representative to the International Council of Scientific Unions--Committee on Teaching of Science, 1991-94

Education Advisory Boards

•   American Association of Variable Star Observers (NSF Curriculum Grant)

•   Hands-On Astrophysics

•   Astronomical Society of the Pacific (NSF Curriculum Grant)

•   Project ASTRO American Astronomical Society project (NSF Curriculum Grant)

•   American Astronomical Society Teacher Resource Agents

•   AASTRA Odyssey, a children's magazine (Cobblestone Publishing)

•   World Book Encyclopedia

•   Griffith Observatory "Depths of Space" Advisory Board, 2001–

•   Astronomy Education Review (National Optical Astronomy Observatories), Council of Advisors, 2002–

•   McGraw-Hill Encyclopedia of Science and Technology and yearbooks, 1983–

Research at l'Institut d'Astrophysique, Paris, Observatoire de Paris

•   Summers 1962, 1964, 1967, January 1973, summer 1976, fall 1988