Past affiliation(s) within the IAU

• Past President of Executive Committee (1994-1997)
• Past President Elect of Executive Committee (1991-1994)
• Past Advisor of Executive Committee (1997-2000)
• Past Organizing Committee Member of Commission 44 Space & High Energy Astrophysics (1994-1997)
• Past Organizing Committee Member of Commission 48 High-Energy Astrophysics (1991-1994)
• Past Organizing Committee Member of Commission 48 High-Energy Astrophysics (1988-1991)
• Past Organizing Committee Member of Commission 48 High-Energy Astrophysics (1985-1988)
• Past Organizing Committee Member of Commission 48 High-Energy Astrophysics (1982-1985)
• Past Member of Commission 48 High-Energy Astrophysics
• Past Member of Division B Facilities, Technologies and Data Science (until 2019)
• Past Member of Division D High Energy Phenomena and Fundamental Physics (until 2019)
• Past Member of Division E Sun and Heliosphere (until 2019)
• Past Member of Division H Interstellar Matter and Local Universe (until 2019)
• Past Member of Division J Galaxies and Cosmology (until 2019)
• Past Member of Commission 10 Solar Activity (until 2015)
• Past Member of Commission 33 Structure & Dynamics of the Galactic System (until 2015)
• Past Member of Commission 34 Interstellar Matter (until 2015)
• Past Member of Commission 40 Radio Astronomy (until 2015)
• Past Member of Commission 44 Space & High Energy Astrophysics (until 2015)
• Past Member of Commission 47 Cosmology (until 2015)
• Past Member of Division II Sun & Heliosphere (until 2012)
• Past Member of Division VI Interstellar Matter (until 2012)
• Past Member of Division VII Galactic System (until 2012)
• Past Member of Division VIII Galaxies & the Universe (until 2012)
• Past Member of Division X Radio Astronomy (until 2012)
• Past Member of Division XI Space & High Energy Astrophysics (until 2012)
• Past Member of Special Nominating Committee (1997-2000)
• Past Member of Special Nominating Committee (1988-1991)