2014 – 2026
Chair of the Board of the OPuS Foundation (Open Access Publishing Services)
2019 – 2023
Member of the Supervisory Board of the DOAB Foundation (Directory of Open Access Books)
2015 – 2023
Member of the Supervisory Board of the Rotterdam Library Foundation
2012 – 2023
Chair of the Board of the Stichting OAPEN (Open Access Publishing in European Networks)
2009 – 2014
Member of the Supervisory Board of Museum Meermanno / Huis van het Boek
2010 – 2014
Member of the Board of the Letterkundig Museum
2009 – 2012
Member of the Executive Board of LIBER (Association of European Research Libraries)
2005 – 2009
Member of the Executive Committee of EBLIDA (European Bureau of Library, Information and Documentation Associations)
2005 – 2009
Chair of the Libraries Committee of the Council for Culture
1994 – 2002
Member of the Supervisory Board of SSH (Stichting Sociale Huisvesting Utrecht)
1998 – 2001
Treasurer of the Dutch Badminton Association
1991 – 1994
Chair of Stichting STUW Utrecht; following a merger, member of the Supervisory Board of Stichting Plaverijn Utrecht (services for people with intellectual disabilities)