Past affiliation(s) within the IAU

• Past President of Commission 15 Physical Study of Comets & Minor Planets (1973-1976)
• Past Vice-President of Commission 15 Physical Study of Comets & Minor Planets (1970-1973)
• Past Organizing Committee Member of Commission 15 Physical Study of Comets & Minor Planets (1976-1979)
• Past Member of Division B Facilities, Technologies and Data Science
• Past Member of Division F Planetary Systems and Astrobiology
• Past Member of Commission 14 Atomic & Molecular Data (until 2015)
• Past Member of Commission 15 Physical Study of Comets & Minor Planets (until 2015)
• Past Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (until 2015)
• Past Member of Commission 51 Bio-Astronomy (until 2015)
• Past Member of Division III Planetary Systems Sciences (until 2012)
• Past Member of Division XII Union-Wide Activities (until 2012)