- editorial board of: Journal of the International Arthurian Society (JIAS)
- member of: the International Arthurian Society
- member of: Commissie Onderzoek en Onderwijs, landelijke Onderzoekschool Mediëvistiek
- board member of: Stichting Aventure
- board member of: Stichting Madoc
- advisory board of: Mediaevalia Lovaniensia
- senior member of: Pegasus Society (Robinson College, Cambridge)
- participant of: the Lancelot-Graal Project (dir.: em. Prof. Alison Stones, University of Pittsburgh)
- participant of: Imaginarm Project (dir.: Dr. Francesco Montorsi, Université de Lyon 2)
- reviewer for: Scriptorium. Bulletin codicologique
- correspondent of: AMARC (Association for Manuscripts and Archives in Research Collections)