Past affiliation(s) within the IAU

• Past President of Commission 17 The Moon (1970-1973)
• Past President of Commission 17 The Moon (1967-1970)
• Past President of Commission 16 Physical Study of Planets & Satellites (1961-1964)
• Past President of Commission 16 Physical Study of Planets & Satellites (1958-1961)
• Past Vice-President of Commission 17 The Moon (1964-1967)
• Past Organizing Committee Member of Commission 17 The Moon (1976-1979)
• Past Organizing Committee Member of Commission 17 The Moon (1973-1976)
• Past Organizing Committee Member of Commission 16 Physical Study of Planets & Satellites (1967-1970)
• Past Organizing Committee Member of Commission 16 Physical Study of Planets & Satellites (1964-1967)
• Past Organizing Committee Member of Commission 44 Space & High Energy Astrophysics (1964-1967)
• Past Member of Commission 17 The Moon
• Past Member of Commission 44 Space & High Energy Astrophysics
• Past Member of Division II Sun & Heliosphere (until 2010)
• Past Member of Division III Planetary Systems Sciences (until 2010)
• Past Member of Commission 10 Solar Activity (until 2010)
• Past Member of Commission 16 Physical Study of Planets & Satellites (until 2010)
• Past Member of Commission 20 Positions & Motions of Minor Planets, Comets & Satellites (until 2010)
• Past Member of Special Nominating Committee (1976-1979)