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a Dutch [https://en.wikipedia.org/wiki/Theoretical_physics theorecial physicist] and researcher at the theory group of [https://en.wikipedia.org/wiki/NIKHEF Nikhef] at [https://en.wikipedia.org/wiki/Amsterdam_Science_Park Amsterdam Science Park]. His research interests include [https://en.wikipedia.org/wiki/Phenomenology_%28particle_physics%29 phenomenology] of [https://en.wikipedia.org/wiki/Particle_physics particles], [https://en.wikipedia.org/wiki/Perturbation_theory perturbative calculations] and [https://en.wikipedia.org/wiki/Symbolic_computation computer algebra], and he is original author of the [https://en.wikipedia.org/wiki/Open-source_software open source] <ref>[http://www.fom.nl/live/english/news/artikel.pag?objectnumber=131866 World's most powerful symbolic manipulation computer program FORM is now available as open source], [http://www.fom.nl/live/english/home.pag Foundation for Fundamental Research on Matter], December 01, 2010 </ref> symbolic manipulation system [https://en.wikipedia.org/wiki/FORM_%28symbolic_manipulation_system%29 FORM] <ref>[http://www.nikhef.nl/~form/ The FORM home site]</ref>. He holds a 4th [https://en.wikipedia.org/wiki/Dan_%28rank%29 dan] in [[GOGo]], has a small art collection and a far going fascination for Japanese food and drinks.