Past affiliation(s) within the IAU

• Past President of Commission 28 Galaxies (1979-1982)
• Past President of Commission 45 Stellar Classification (1970-1973)
• Past Vice-President of Commission 28 Galaxies (1976-1979)
• Past Vice-President of Commission 45 Stellar Classification (1967-1970)
• Past Organizing Committee Member of Commission 28 Galaxies (1982-1985)
• Past Organizing Committee Member of Commission 28 Galaxies (1973-1976)
• Past Organizing Committee Member of Commission 33 Structure & Dynamics of the Galactic System (1973-1976)
• Past Organizing Committee Member of Commission 45 Stellar Classification (1973-1976)
• Past Organizing Committee Member of Commission 33 Structure & Dynamics of the Galactic System (1970-1973)
• Past Organizing Committee Member of Commission 45 Stellar Classification (1964-1967)
• 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 45 Stellar Classification (until 2015)
• Past Member of Division IV Stars (until 2012)
• Past Member of Division VII Galactic System (until 2012)
• Past Member of Division VIII Galaxies & the Universe (until 2012)
• Past Member of Special Nominating Committee (1979-1982)