In his research and lecturing he focuses on topics related to law and internet, such as liability, contracting, security, privacy, freedom of speech, cybercrime; and phenomena related to big data, social media, cyberwar, internet of things, smart devices and apps. He has published over 30 (co-)edited and (co-)authored books, such as DiaLaw on Legal Justification and Dialogical Models of Argumentation (1999), e-Directives, Guide To European Union Law On E-commerce (2002), Information Technology and Lawyers. Advanced Technology in the Legal Domain (2006), Enhanced Dispute Resolution Through the Use of Information Technology (2010), Cyberlaw in the Netherlands (2016), and EU Regulation of E-commerce (2017). He is involved in the Dutch legal master Internet, IP and ICT (2011-), the English Bachelor Minor Technology, Law, and Ethics (2017-), and the English legal master International Technology Law (2018-). His internet law group offers about 15 courses in Dutch/English on legal (and ethical) aspects of i.a. blockchain (master course as of 2018/19), robots and artificial intelligence (bachelor course as of 2017/18, master 2018/19), e-commerce, data protection, copyright, and cybercrime.

Fun fact: Fanatic table tennis player, regularly playing 3-4 hours at night.