Past affiliation(s) within the IAU

• Past President of Executive Committee (1970-1973)
• Past General Secretary of Executive Committee (1948-1952)
• Past Advisor of Executive Committee (1973-1976)
• Past Advisor of Executive Committee (1952-1955)
• Past President of Commission 34 Interstellar Matter (1961-1964)
• Past Chair of Special Nominating Committee (1970-1973)
• Past Advisor of Special Nominating Committee (1973-1976)
• Past Organizing Committee Member of Commission 45 Stellar Classification (1964-1967)
• Past Organizing Committee Member of Commission 33 Structure & Dynamics of the Galactic System (1961-1964)
• Past Member of Commission 33 Structure & Dynamics of the Galactic System
• Past Member of Commission 34 Interstellar Matter
• Past Member of Commission 45 Stellar Classification
• Past Member of Resolutions Committee (1973-1976)
• Past Member of Resolutions Committee (1964-1967)