Past affiliation(s) within the IAU

• Past Vice-President of Executive Committee (1988-1991)
• Past Vice-President of Executive Committee (1985-1988)
• Past President of Commission 42 Close Binary Stars (1982-1985)
• Past President of Commission 30 Radial Velocities (1976-1979)
• Past Vice-President of Commission 42 Close Binary Stars (1979-1982)
• Past Vice-President of Commission 30 Radial Velocities (1973-1976)
• Past Organizing Committee Member of Commission 46 Astronomy Education & Development (2003-2006)
• Past Organizing Committee Member of Commission 46 Astronomy Education & Development (2000-2003)
• Past Organizing Committee Member of Commission 46 Astronomy Education & Development (1997-2000)
• Past Organizing Committee Member of Commission 46 Astronomy Education & Development (1994-1997)
• Past Organizing Committee Member of Commission 42 Close Binary Stars (1985-1988)
• Past Organizing Committee Member of Commission 30 Radial Velocities (1979-1982)
• Past Organizing Committee Member of Commission 26 Double & Multiple Stars (1976-1979)
• Past Organizing Committee Member of Commission 42 Close Binary Stars (1976-1979)
• Past Organizing Committee Member of Commission 26 Double & Multiple Stars (1973-1976)
• Past Organizing Committee Member of Commission 42 Close Binary Stars (1973-1976)
• Past Organizing Committee Member of Commission 42 Close Binary Stars (1970-1973)
• Past Organizing Committee Member of Commission 30 Radial Velocities (1967-1970)
• Past Organizing Committee Member of Commission 42 Close Binary Stars (1967-1970)
• Past Member of Division A Fundamental Astronomy (until 2024)
• Past Member of Division C Education, Outreach and Heritage (until 2024)
• Past Member of Division G Stars and Stellar Physics (until 2024)
• Past Member of Commission C1 Astronomy Education and Development (2015-2024)
• Past Member of Commission C3 History of Astronomy (2015-2024)
• Past Member of Commission C4 World Heritage and Astronomy (2019-2024)
• Past Member of Commission G1 Binary and Multiple Star Systems (2015-2024)
• Past Member of Commission C4 WG Windows to the Universe: Classical and Modern Observatories (2019-2024)
• Past Member of Commission 26 Double & Multiple Stars (until 2015)
• Past Member of Commission 30 Radial Velocities (until 2015)
• Past Member of Commission 41 History of Astronomy (until 2015)
• Past Member of Commission 42 Close Binary Stars (until 2015)
• Past Member of Commission 46 Astronomy Education & Development (until 2015)
• Past Member of Commission 41 WG Astronomy and World Heritage (until 2015)
• Past Member of Commission 26 WG Catolog of Orbital Elements of Spectroscopic Binary Systems (until 2015)
• Past Member of Division IV Stars (until 2012)
• Past Member of Division V Variable Stars (until 2012)
• Past Member of Division IX Optical & Infrared Techniques (until 2012)
• Past Member of Division XII Union-Wide Activities (until 2012)
• Past Member of Special Nominating Committee (2006-2009)
• Past Member of Resolutions Committee (1991-1994)
• Past Member of Resolutions Committee (1988-1991)
• Past Member of Resolutions Committee (1982-1985)
• Past Member of Special Nominating Committee (1979-1982)