Past affiliation(s) within the IAU

• Past Vice-President of Executive Committee (1991-1994)
• Past Vice-President of Executive Committee (1988-1991)
• Past President of Commission 38 Exchange of Astronomers (1997-2000)
• Past Vice-President of Commission 38 Exchange of Astronomers (1994-1997)
• Past Organizing Committee Member of Commission 38 Exchange of Astronomers (1991-1994)
• Past Organizing Committee Member of Commission 28 Galaxies (1973-1976)
• Past Organizing Committee Member of Commission 28 Galaxies (1970-1973)
• Past Member of Commission 38 Exchange of Astronomers
• Past Member of Division B Facilities, Technologies and Data Science (until 2024)
• Past Member of Division C Education, Outreach and Heritage (until 2024)
• Past Member of Division H Interstellar Matter and Local Universe (until 2024)
• Past Member of Division J Galaxies and Cosmology (until 2024)
• Past Member of Commission 28 Galaxies (until 2015)
• Past Member of Commission 33 Structure & Dynamics of the Galactic System (until 2015)
• Past Member of Commission 40 Radio Astronomy (until 2015)
• Past Member of Commission 46 Astronomy Education & Development (until 2015)
• Past Member of Division VII Galactic System (until 2012)
• Past Member of Division VIII Galaxies & the Universe (until 2012)
• Past Member of Division X Radio Astronomy (until 2012)
• Past Member of Division XII Union-Wide Activities (until 2012)