| 2006-2009 |
Board of Directors, Astronomical Society of the Pacific |
| 2003-2005 |
Member, NASA-NSF Astronomy and Astrophysics Advisory
Committee |
| 2002-2006 |
Chair, NASA Planetary Data System Working Group |
| 2002-2006 |
Member, AAS Committee on Astronomy and Public Policy |
| 2001-2002 |
Consultative Member, National Virtual Observatory
Science Definition Team |
| 2001-2002 |
Chair, DPS Prize Subcommittee |
| 2000-2001 |
Chair, Division for Planetary Sciences, American
Astronomical Society |
| 1999-2000 |
Vice-Chair, DPS |
| 1996-1999 |
DPS Committee Member |
| 1996 |
Program Chair, 28th Annual DPS Meeting. Tucson, Arizona |
| 1995 |
Program Committee. 27th Annual DPS Meeting. Kona, Hawaii |
| 1995 |
Chair, Small Bodies Section. NASA Planetary Astronomy Review
Panel. |
| 1994 |
NASA Planetary Astronomy Review Panel |
| 1993-1997 |
Infrared Processing and Analysis Center (IPAC) User
Committee |
| 1993 |
Organizer and Moderator, Space Energy Resource Utilization
Initiative Workshop. Lafayette, Louisiana. |
| 1992-1995 |
DPS Nominating Subcommittee. Chairman, 1994-1995. |
| 1992-1995 |
NASA Planetary Science Data Steering Group. Chair,
Spacecraft data rights subcommittee. |
| 1990 |
Space Exploration Initiative Lunar Outpost Site Selection
Strategy Workshop II. Johnson Space Center. |
| 1990 |
Space Exploration Initiative Lunar Outpost Site Selection
Strategy Workshop I. Johnson Space Center. |
| 1989 |
Lunar Science Strategy Workshop (for the Exploration and
Development of the Moon). Astronomy and Astrophysics Working Group. Johnson
Space Center. |
| 1989 |
NASA Astrophysics Proposal Review Panel. |
| 1989 |
Cosmic Background Explorer (COBE) Data Aquisition and
Analysis (Pre-Flight) Review. Goddard Space Flight Center. |