Bachelor of Information Science (1987), graduated in (technical) EDP Auditing from the Free University of Amsterdam (1992).
Worked with Moret Ernst & Young from 1988 to 1992. Co-project leader for research projects on data communication and Electronic Data Interchange. Specialized in audits on logical access control for Siemens-Nixdorf computers (BS2000 operating system). Wide experience with computer centre audits. publications on Electronic Data Interchange (EDI).