Past affiliation(s) within the IAU

• Past President of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1970-1973)
• Past Vice-President of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1967-1970)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1979-1982)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1976-1979)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1973-1976)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1964-1967)
• Past Organizing Committee Member of Commission 30 Radial Velocities (1964-1967)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1961-1964)
• Past Organizing Committee Member of Commission 30 Radial Velocities (1961-1964)
• Past Member of Commission 30 Radial Velocities (until 2015)
• Past Member of Commission 33 Structure & Dynamics of the Galactic System (until 2015)
• Past Member of Commission 41 History of Astronomy (until 2015)
• Past Member of Division III Planetary Systems Sciences (until 2012)
• Past Member of Division VII Galactic System (until 2012)
• Past Member of Division IX Optical & Infrared Techniques (until 2012)
• Past Member of Division XII Union-Wide Activities (until 2012)
• Past Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1961-1982)
• Past Member of Finance Committee (1973-1976)