Past affiliation(s) within the IAU

• Past President of Commission 12 Solar Radiation & Structure (1958-1961)
• Past President of Commission 44 Space & High Energy Astrophysics (1964-1967)
• Past President of Commission 44 Space & High Energy Astrophysics (1961-1964)
• Past President of Executive Committee (1973-1976)
• Past Vice-President of Executive Committee (1961-1964)
• Past Vice-President of Executive Committee (1958-1961)
• Past Chair of Resolutions Committee (1973-1976)
• Past Chair of Special Nominating Committee (1973-1976)
• Past Organizing Committee Member of Commission 44 Space & High Energy Astrophysics (1970-1973)
• Past Organizing Committee Member of Commission 44 Space & High Energy Astrophysics (1967-1970)
• Past Organizing Committee Member of Commission 51 Bio-Astronomy (1985-1988)
• Past Organizing Committee Member of Commission 51 Bio-Astronomy (1982-1985)
• Past Advisor of Executive Committee (1976-1979)
• Past Advisor of Special Nominating Committee (1976-1979)
• Past Member of Commission 12 Solar Radiation & Structure
• Past Member of Commission 44 Space & High Energy Astrophysics
• Past Member of Commission 51 Bio-Astronomy