Earlier employment & formal education

Earlier employment

• Jan. 1987 - June 1987: Visiting Professor Computer Science at Northwestern University, Chicago, U.S.A.
• Jan. 1986 - July 1986: Associate Professor Computer Science at University of Groningen (part-time)
• Jan. 1984 - Aug. 1987: Assistant Professor Computer Science at Vrije Universiteit, Amsterdam
• Jan. 1980 - Dec. 1983: Researcher of ZWO (Dutch Scientific Research Organisation) at VU
• Sept. 1976 - Jan. 1980: Teaching Assistant Computer Science at Vrije Universiteit (part-time)
• Febr. 1975 - Aug. 1976: Teacher Math. & Physics at Patrimonium's Technical School (part-time)

Formal education

• Ph.D., Mathematics & Sciences, at VU (Vrije Universiteit) in Amsterdam, June 1985;
  title of Ph.D. thesis: "Security & Privacy in Information Systems - some technical aspects".
• M.Sc., Math. & Computer Science with Economics, at VU in Amsterdam ('cum laude'), Dec. 1979.
• B.Sc., Mathematics & Physics with Astronomy, at VU in Amsterdam ('cum laude'), Jan. 1975.
• Gymnasium- ß, at Hervormd Lyceum West in Amsterdam, May 1972.