Past affiliation(s) within the IAU

• Past Vice-President of Executive Committee (1967-1970)
• Past Vice-President of Executive Committee (1964-1967)
• Past President of Commission 10 Solar Activity (1961-1964)
• Past President of Commission 10 Solar Activity (1958-1961)
• Past Organizing Committee Member of Commission 10 Solar Activity (1967-1970)
• Past Organizing Committee Member of Commission 10 Solar Activity (1964-1967)
• Past Organizing Committee Member of Commission 43 Astrophysical Plasmas and Magnetohydrodynamics (1964-1967)
• Past Organizing Committee Member of Commission 43 Astrophysical Plasmas and Magnetohydrodynamics (1961-1964)
• Past Member of Commission 43 Astrophysical Plasmas and Magnetohydrodynamics
• Past Member of Special Nominating Committee (1973-1976)
• Past Member of Commission 10 Solar Activity (1964-1970)
• Past Member of Resolutions Committee (1967-1970)