Weyer specialises in competition law and leads Houthoff’s Competition practice group. He is also head of Houthoff’s Healthcare sector group. Weyer focuses in particular on merger notifications and cartel defence litigation. His work involves issues relating to regulation and competition in healthcare, and advising and assisting healthcare institutions in the context of partnerships.
Weyer was a resident partner of the Brussels office from 1997 to 2005. He is a member of the International Bar Association, the ABA, the Dutch Competition Law Association and the Dutch Association for European Law. He is also Chair-Emeritus of Lex Mundi's Antitrust, Competition and Trade group; non-governmental advisor of the Dutch Authority for Consumers and Markets; and chair of the advisory committee of the Netherlands Bar Association. Weyer is the founder and a board member of the competition law foundation Stichting Ontwikkelingen Mededingingsrecht, and has authored and co-authored various books on competition law, including European Competition Law (Edward Elgar) and Nederlands Mededingingsrecht (Kluwer).