Dolf is part of the TMC Group, Sports & Media, at CMS, specialising in matters of Technology, Media and Sport. Dolf has a special interest in sports law and sports-related issues such as governance in sport, sport related litigation, broadcasting & digital media, e-sports and events. He has taken up a number of board functions in sport, both on national and international level. He has published several articles related to sport and is a regular speaker at sports law seminars. In 2015 he was awarded the medal of honour by the Dutch Olympic Committee for his involvement in sport. His client base consists of Dutch premier league clubs, sports federations, sports marketing agencies, event organisers and one of world's largest sports equipment and sports apparel brands.
Dolf served as member of the board of CMS NL from 2002 to 2016, of which the last 8 years as chairman (managing partner). From 2000 to 2016 he was also member of the executive committee of CMS International.