Willem Grosheide's past and present commitment to and interest in his specialties is evidenced (in addition to his national and international publications and his foreign teaching and research positions ) by, among other things, his longstanding editorial board positions of Dutch and international leading professional journals such as Nederlands Tijdschrift voor Burgerlijk Recht, Contracteren, Informatierecht/AMI, Intellectuele Eigendom& Reclamerecht, and Queen Mary Journal of Intellectual Property;  his appointment as a deputy judge at the Amsterdam District Court; his chairmanship of the Amsterdams Juridisch Genootschap; his memberships of the board of the Dutch Copyright Law Association; the Association Littéraire et Artistique Internationale; and the Association for the Teaching and Research in Intellectual Property Law.Honorary member of the Dutch Copyright Society.  Honorary editor of the journal Contracteren.