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[TiiS Logo] Coeditor-in-chief (with Krzysztof Gajos) of the ACM Transactions on Interactive Intelligent Systems (TiiS).
[CATCH Logo] Chair of the International Scientific Advisory Board of the research program Continuous Access To Cultural Heritage (CATCH), funded by the Netherlands Organisation for Scientific Research (NWO)

Earlier (Selection)

[CHI 2013 logo] Associate chair for CHI 2013, the Conference on Human Factors in Computing Systems (27 April – 2 May 2013, Paris, France)
[IUI logo] Program cochair (with John Riedl) of IUI 2005, the International Conference on Intelligent User Interfaces (9-12 January 2005, San Diego)
[UMUAI logo] Member of the editorial board of User Modeling and User-Adapted Interaction: The Journal of Personalization Research (1993 - 2001)
[Acta Psychologica logo] Member of the editorial board of Acta Psychologica (1988–1995)
[UM97 logo] Co-chair (with Cécile Paris) of the program committee of UM97, the Sixth International Conference on User Modeling (Sardinia, June 1997)

Complete on-line proceedings, including rich index

[GK logo] Executive officer, from March 1996 through September 1999, of the German Cognitive Science Society [[German]](Gesellschaft für Kognitionswissenschaft e.V.)