Past affiliation(s) within the IAU

• Past Vice-President of Executive Committee (1982-1985)
• Past Vice-President of Executive Committee (1979-1982)
• Past President of Commission 15 Physical Study of Comets & Minor Planets (1985-1988)
• Past President of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1973-1976)
• Past Vice-President of Commission 15 Physical Study of Comets & Minor Planets (1982-1985)
• Past Vice-President of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1970-1973)
• Past Organizing Committee Member of Commission 15 Physical Study of Comets & Minor Planets (1991-1994)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1991-1994)
• Past Organizing Committee Member of Commission 15 Physical Study of Comets & Minor Planets (1988-1991)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1988-1991)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1985-1988)
• Past Organizing Committee Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1982-1985)
• Past Organizing Committee Member of Commission 15 Physical Study of Comets & Minor Planets (1979-1982)
• 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 22 Meteors, Meteorites & Interplanetary Dust (1973-1976)
• Past Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (1976-1994)
• Past Member of Commission 15 Physical Study of Comets & Minor Planets (1979-1991)
• Past Member of Commission 22 Meteors, Meteorites & Interplanetary Dust (1973-1976)