· Current HIIT Researcher (Postdoctoral Fellow or Research Fellow), Helsinki Institute for Information Technology (HIIT)2024–
· Researcher, Centrum Wiskunde & Informatica (CWI)2011–2022
· Visiting Researcher, Microsoft Research2005–
· Visiting Researcher, Stanford University2001–
· Professor of Information Systems (Multimedia Databases), University of Amsterdam1994–2011
· Head of the Department of Information Systems, Centrum Wiskunde & Informatica (CWI)1992–1997
· Associate Professor, University of Amsterdam1992–1994
· Chief Scientific Officer and Head of Database Research Group, Centrum Wiskunde & Informatica (CWI)1985–2011
· Visiting Researcher, University of California, San Francisco1980–
· Doctorate in Mathematics (with extensions in Computer Science), Vrije Universiteit Amsterdam1979–1985
· Master's Degree in Mathematics, Vrije Universiteit Amsterdam1979–
· Associate Professor, Vrije Universiteit, Amsterdam1979–1994