Past affiliation(s) within the IAU

• Past President of Commission 45 Stellar Classification (1988-1991)
• Past President of Commission 25 Astronomical Photometry and Polarimetry (1973-1976)
• Past President of Commission 37 Star Clusters & Associations (1967-1970)
• Past Vice-President of Commission 45 Stellar Classification (1985-1988)
• Past Vice-President of Commission 25 Astronomical Photometry and Polarimetry (1970-1973)
• Past Organizing Committee Member of Commission 45 Stellar Classification (1991-1994)
• Past Organizing Committee Member of Commission 45 Stellar Classification (1982-1985)
• Past Organizing Committee Member of Commission 37 Star Clusters & Associations (1970-1973)
• Past Organizing Committee Member of Commission 25 Astronomical Photometry and Polarimetry (1967-1970)
• Past Member of Division B Facilities, Technologies and Data Science
• Past Member of Division G Stars and Stellar Physics
• Past Member of Division H Interstellar Matter and Local Universe
• Past Member of Commission 25 Astronomical Photometry and Polarimetry (until 2015)
• Past Member of Commission 37 Star Clusters & Associations (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 IX Optical & Infrared Techniques (until 2012)