Member Program Committee of the International Program Committee (IPC) for the “Eurographics Symposium on Virtual Environments” (EGVE 2008), Eindhoven, May 29-30, 2008.

Member Program Committee of the Brainplay 2007 workshop at the 4th International Conference on Advances in Computer Entertainment Technology (ACE 2007), Salzburg, Austria, June 2007.

Member Conference Committeeof the  International Community on Information Systems for Crisis Response  and Management 2007 (ISCRAM 2007), Delft, May 13, 2007.

Technical Evaluator of the NATO HFM 121 (Virtual Environments for Intuitive Human-System Interaction) / RTG 042 workshop, Virtual Media for Military Applications,  Newport, Rhode Island, May 23-24, 2006.

Member Program Committee "
ICT Kenniscongres 2006",  RAI Amsterdam, April 10-11, 2006.Member Program Committee

Chair (Exhibition) and member of the Technical Program Committee of the IEEE International Conference on Multimedia & Expo (ICME 2005), Amsterdam, July 6-8, 2005.

Member Program Committee "ICT Kenniscongres 2003", The Hague, September 2003.

General Chair of the Conference “Trends and prognoses ICT”, Zeist, 4 oktober 2002.

Member Program Committee "ICT Kenniscongres 2002", The Hague, September 2002.

Chair (Organization) and member of the Technical Program Committee of the NATO RTO Human Factors & Medicine Panel Conference "What is essential for Virtual Reality systems to meet military human performance goals?". The Hague, April 13-15, 2000.

Member Program Committee NATO workshop "Human Factors Issues in the Military Use of Virtual Reality", Orlando, December 5-9, 1997.