|Publications and Memberships - Board Memberships|
|Board Memberships and Committee Memberships Professional Club|
1991: Re-elected as chairman of the NGI/Databaseclub. Ended chairmanship in 1995 and membership in 1996.
1991: Board Member of the British Computer Society - Netherlands Section.
1991: Board Member of the VRI (Vereniging van Register Informatici in Dutch and in English "The Netherlands Association of Registered Informatics Specialists").
1994: Member of the Council of European Professional Informatics Societies (CEPIS) on behalf of the VRI.
2000: Member of the Board of ISACA NL Chapter (Information Systems and Control Association).