Conferences and schools organized:
1. Belgian-Dutch-German meeting on high-energy theory Bad Honnef (1984) 2. 2nd Dutch Winterschool on theoretical high-energy physics Doorwerth (1988) 3. Dutch summerschool of Mathematical Physics University of Twente (1992) 4. 5th Belgian-Dutch-German Summerschool on experimental high-energy physics Dalfsen (1993) 5. 6th annual meeting on Physics Beyond the Standard Model Bad-Honnef (1994) 6. Symposium on Detection of Gravitational Radiation NIKHEF, Amsterdam (1994) 7. GRAIL Workshop on Gravitational Radiation University of Twente (1995) 8. 8th Dutch Winterschool on theoretical high-energy-physics Dalfsen (1996) 9. Symposium Resonant Mass Detection of Gravitational Waves NIKHEF, Amsterdam (1997) 10. XXXVth Karpacz Winterschool of Theoretical Physics Polonica, Poland (1999) 11. 15th Dutch Winterschool of Theoretical Physics Jonkerbosch, Nijmegen (2001) 12. Physics Beyond the Standard Model Bad Honnef (2006)