Past affiliation(s) within the IAU

• Past President of Commission 4 Ephemerides (1976-1979)
• Past Vice-President of Commission 4 Ephemerides (1973-1976)
• Past Organizing Committee Member of Commission 4 Ephemerides (2000-2003)
• Past Organizing Committee Member of Commission 4 Ephemerides (1997-2000)
• Past Organizing Committee Member of Commission 4 Ephemerides (1994-1997)
• Past Organizing Committee Member of Commission 7 Celestial Mechanics & Dynamical Astronomy (1994-1997)
• Past Organizing Committee Member of Commission 4 Ephemerides (1991-1994)
• Past Organizing Committee Member of Commission 4 Ephemerides (1988-1991)
• Past Organizing Committee Member of Commission 4 Ephemerides (1985-1988)
• Past Organizing Committee Member of Commission 4 Ephemerides (1982-1985)
• Past Organizing Committee Member of Commission 4 Ephemerides (1979-1982)
• Past Organizing Committee Member of Commission 4 Ephemerides (1970-1973)
• Past Member of Division A Fundamental Astronomy (until 2018)
• Past Member of Division B Facilities, Technologies and Data Science (until 2018)
• Past Member of Division C Education, Outreach and Heritage (until 2018)
• Past Member of Division F Planetary Systems and Astrobiology (until 2018)
• Past Member of Commission 4 Ephemerides (until 2015)
• Past Member of Commission 5 Documentation & Astronomical Data (until 2015)
• Past Member of Commission 7 Celestial Mechanics & Dynamical Astronomy (until 2015)
• Past Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (until 2015)
• Past Member of Commission 41 History of Astronomy (2003-2015)
• Past Member of Commission 41 WG Astronomy and World Heritage (2009-2015)
• Past Member of Division I Fundamental Astronomy (until 2012)
• Past Member of Division III Planetary Systems Sciences (until 2012)
• Past Member of Division XII Union-Wide Activities (until 2012)
• Past Member of Special Nominating Committee (1985-1988)