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 27 Variable Stars (1973-1976)
• Past President of Commission 29 Stellar Spectra (1967-1970)
• Past Vice-President of Commission 27 Variable Stars (1970-1973)
• Past Vice-President of Commission 29 Stellar Spectra (1964-1967)
• Past Organizing Committee Member of Commission 28 Galaxies (1997-2000)
• Past Organizing Committee Member of Commission 28 Galaxies (1994-1997)
• Past Organizing Committee Member of Commission 27 Variable Stars (1979-1982)
• Past Organizing Committee Member of Commission 27 Variable Stars (1976-1979)
• Past Organizing Committee Member of Commission 29 Stellar Spectra (1973-1976)
• Past Organizing Committee Member of Commission 29 Stellar Spectra (1970-1973)
• Past Organizing Committee Member of Commission 27 Variable Stars (1964-1967)
• Past Organizing Committee Member of Commission 29 Stellar Spectra (1961-1964)
• Past Member of Division G Stars and Stellar Physics (until 2019)
• Past Member of Division H Interstellar Matter and Local Universe (until 2019)
• Past Member of Division J Galaxies and Cosmology (until 2019)
• Past Member of Commission 27 Variable Stars (until 2015)
• Past Member of Commission 28 Galaxies (until 2015)
• Past Member of Commission 29 Stellar Spectra (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 V Variable Stars (until 2012)
• Past Member of Division VII Galactic System (until 2012)
• Past Member of Division VIII Galaxies & the Universe (until 2012)