Past affiliation(s) within the IAU

• Past President of Division I Fundamental Astronomy (1994-1997)
• Past President of Commission 7 Celestial Mechanics & Dynamical Astronomy (1982-1985)
• Past President of Commission 4 Ephemerides (1970-1973)
• Past Vice-President of Commission 7 Celestial Mechanics & Dynamical Astronomy (1979-1982)
• Past Vice-President of Commission 4 Ephemerides (1967-1970)
• Past Chair of Resolutions Committee (2000-2003)
• Past Advisor of Division I Fundamental Astronomy (1997-2000)
• Past Organizing Committee Member of Division I Fundamental Astronomy (1997-2000)
• Past Organizing Committee Member of Commission 8 Astrometry (1997-2000)
• Past Organizing Committee Member of Division I Fundamental Astronomy (1994-1997)
• Past Organizing Committee Member of Commission 8 Astrometry (1994-1997)
• Past Organizing Committee Member of Commission 31 Time (1994-1997)
• Past Organizing Committee Member of Commission 50 Protection of Existing & Potential Observatory Sites (1994-1997)
• Past Organizing Committee Member of Commission 8 Astrometry (1991-1994)
• Past Organizing Committee Member of Commission 31 Time (1991-1994)
• Past Organizing Committee Member of Commission 50 Protection of Existing & Potential Observatory Sites (1991-1994)
• Past Organizing Committee Member of Commission 8 Astrometry (1988-1991)
• Past Organizing Committee Member of Commission 31 Time (1988-1991)
• Past Organizing Committee Member of Commission 7 Celestial Mechanics & Dynamical Astronomy (1985-1988)
• Past Organizing Committee Member of Commission 31 Time (1985-1988)
• Past Organizing Committee Member of Commission 4 Ephemerides (1973-1976)
• Past Organizing Committee Member of Commission 7 Celestial Mechanics & Dynamical Astronomy (1970-1973)
• Past Organizing Committee Member of Commission 7 Celestial Mechanics & Dynamical Astronomy (1967-1970)
• Past Organizing Committee Member of Commission 4 Ephemerides (1964-1967)
• Past Organizing Committee Member of Commission 7 Celestial Mechanics & Dynamical Astronomy (1964-1967)
• Past Organizing Committee Member of Commission 4 Ephemerides (1961-1964)
• Past Organizing Committee Member of Commission 7 Celestial Mechanics & Dynamical Astronomy (1961-1964)
• Past Member of Division A Fundamental Astronomy (until 2015)
• Past Member of Division B Facilities, Technologies and Data Science (until 2015)
• Past Member of Commission 7 Celestial Mechanics & Dynamical Astronomy (until 2015)
• Past Member of Commission 8 Astrometry (until 2015)
• Past Member of Commission 31 Time (until 2015)
• Past Member of Commission 50 Protection of Existing & Potential Observatory Sites (until 2015)
• Past Member of Commission 52 Relativity in Fundamental Astronomy (until 2015)
• Past Member of Division I Fundamental Astronomy (until 2012)
• Past Member of Division XII Union-Wide Activities (until 2012)
• Past Member of Resolutions Committee (1997-2000)
• Past Member of Commission 4 Ephemerides (1961-1976)