Past President of Commission 38 Exchange of Astronomers (1982-1985)
Past President of Commission 42 Close Binary Stars (1967-1970)
Past Vice-President of Commission 38 Exchange of Astronomers (1979-1982)
Past Organizing Committee Member of Commission 38 Exchange of Astronomers (1985-1988)
Past Organizing Committee Member of Commission 38 Exchange of Astronomers (1976-1979)
Past Organizing Committee Member of Commission 38 Exchange of Astronomers (1973-1976)
Past Organizing Committee Member of Commission 42 Close Binary Stars (1973-1976)
Past Organizing Committee Member of Commission 38 Exchange of Astronomers (1970-1973)
Past Organizing Committee Member of Commission 42 Close Binary Stars (1970-1973)
Past Organizing Committee Member of Commission 42 Close Binary Stars (1964-1967)
Past Organizing Committee Member of Commission 42 Close Binary Stars (1961-1964)
Past Member of Commission 38 Exchange of Astronomers
Past Member of Commission 42 Close Binary Stars