Past affiliation(s) within the IAU

• Past President of Commission 19 Rotation of the Earth (1964-1967)
• Past President of Commission 19 Rotation of the Earth (1961-1964)
• Past Organizing Committee Member of Commission 52 Relativity in Fundamental Astronomy (2009-2012)
• Past Organizing Committee Member of Commission 52 Relativity in Fundamental Astronomy (2006-2009)
• Past Organizing Committee Member of Commission 31 Time (1994-1997)
• Past Organizing Committee Member of Commission 31 Time (1991-1994)
• Past Organizing Committee Member of Commission 31 Time (1988-1991)
• Past Organizing Committee Member of Commission 31 Time (1985-1988)
• Past Organizing Committee Member of Commission 31 Time (1982-1985)
• Past Organizing Committee Member of Commission 31 Time (1979-1982)
• Past Organizing Committee Member of Commission 31 Time (1976-1979)
• Past Organizing Committee Member of Commission 31 Time (1973-1976)
• Past Organizing Committee Member of Commission 19 Rotation of the Earth (1970-1973)
• Past Organizing Committee Member of Commission 31 Time (1970-1973)
• Past Organizing Committee Member of Commission 19 Rotation of the Earth (1967-1970)
• Past Member of Division A Fundamental Astronomy (until 2017)
• Past Member of Commission 19 Rotation of the Earth (until 2015)
• Past Member of Commission 31 Time (until 2015)
• Past Member of Commission 52 Relativity in Fundamental Astronomy (until 2015)
• Past Member of Division I Fundamental Astronomy (until 2012)