Home / People / Willem Hoorneman
Picture of Willem Hoorneman

Willem Hoorneman

Managing Partner

Atrium - Parnassusweg 737
1077 DG Amsterdam
PO Box 94700
1090 GS Amsterdam
Languages English, Dutch

Willem Hoorneman has been managing partner of CMS in the Netherlands since 2016. He is a member of the IP/TMC Practice Group, especially within Life Sciences. With energy and commitment Willem heads the Life Sciences Group in the Netherlands which stands for new growth.

With more than 30 years of experience in intellectual property (IP) and author of the patent chapters in the leading handbook on software protection in the Netherlands, Willem is considered a pre-eminent IP lawyer, and one of the very best in the field of patent law. In addition, for years he was editor-in-chief of the BMM Bulletin, a leading magazine on trademark and design law in the Benelux. Willem is internationally recognized for his expertise.

Willem has earned an excellent reputation as a litigator for various IP matters. He is also a panelist of the World Intellectual Property Organization (WIPO) for domain name alternative dispute resolution.

Follow Willem on Twitter and keep up to date on the latest news concerning Life Sciences: @wajh0107.

more less

Willem Hoorneman is recommended.

The Legal 500, 2019

Willem Hoorneman is a key client contact for this practice.

Chambers Europe, 2018


  • Dutch Law, University of Amsterdam
more less


  • Head of CMS Life Sciences Sector Group
  • Managing Partner
more less


Show only
CMS an­nounces rev­en­ues of EUR 1.36 bil­lion for 2018...
Top rank­ings CMS in The Leg­al 500 EMEA 2019
CMS event in Da­v­os: “The Power of the Plat­form: A New...
4 star BREEAM-NL cer­ti­fic­ate for CMS of­fice at Zui­das
21 Nov 19
CMS Glob­al Life Sci­ences & Health­care For­um 2019
Fu­ture fa­cing and pa­tient-cent­ric – in­nov­a­tion and...
CMS rank­ings in The Leg­al 500 EMEA 2018
Mov­ing times
Con­tinu­ity and sta­bil­ity are vi­tal when it comes to...
Ap­point­ments at CMS: COO and head HRM
CMS Neth­er­lands elects a new board of dir­ect­ors and...