Affiliation(s) within the IAU

• Member of Division G Commission 29 Stellar Spectra
• Member of Division G Commission 42 Close Binary Stars
• Member of Division D Commission 44 Space & High Energy Astrophysics
• Member of Division C Commission 46 Astronomy Education & Development

Past affiliation(s) within the IAU

• Past President of Executive Committee (1985-1988)
• Past Vice-President of Executive Committee (1970-1973)
• Past Vice-President of Executive Committee (1967-1970)
• Past Chair of Special Nominating Committee (1985-1988)
• Past Organizing Committee Member of Division V Variable Stars (2003-2006)
• Past Advisor of Executive Committee (1988-1991)
• Past Advisor of Special Nominating Committee (1988-1991)
• Past Member of Division IV Stars (until 2012)
• Past Member of Division V Variable Stars (until 2012)
• Past Member of Division XI Space & High Energy Astrophysics (until 2012)
• Past Member of Division XII Union-Wide Activities (until 2012)
• Past Member of Resolutions Committee (1994-1997)