Affiliation(s) within the IAU

• Member of Division C Education, Outreach and Heritage
• Member of Division E Sun and Heliosphere
• Member of Division E Commission 10 Solar Activity
• Member of Division C Commission 41 History of Astronomy

Past affiliation(s) within the IAU

• Past President of Division C Commission 41 History of Astronomy (1985-1988)
• Past Member of Division II Sun & Heliosphere (until 2012)
• Past Member of Division XII Union-Wide Activities (until 2012)