Mr Koen T'Syen > Van Bael & Bellis > Brussels, Belgium > Lawyer Profile

Van Bael & Bellis
Koen T'Syen photo

Work Department

Litigation, Corporate and commercial, Competition


Counsel Koen T’Syen specialises in commercial litigation and competition law.

Koen has successfully represented clients before civil and administrative courts as well as in alternative dispute resolution procedures such as mediation. He also advises clients on a wide range of commercial matters including contract law, distribution law and unfair market practices.

Koen has extensive experience in and knowledge of the life sciences and energy sectors, both at the Belgian and EU levels.

In the field of competition law, Koen focuses on abuses of dominance and cartels. Koen was appointed as the National Reporter for Belgium at the 2016 Congress of the International League of Competition Law (LIDC) in Geneva in view of his expertise in life sciences and competition law.

He regularly writes articles on Belgian business law and competition law issues.


Koen joined Van Bael & Bellis as an associate in 2007.


Koen speaks Dutch, French and English.


Member of the Brussels Bar


College of Europe, Bruges, LL.M. in European Legal Studies, 2007
University of Leuven, Master of Laws, 2006
University of Namur, Bachelor of Law, 2003

Lawyer Rankings

Belgium > Industry focus: Healthcare and life sciences

The market-leading life sciences practice at Van Bael & Bellis fields a strong and sizeable team able to advise on a host of contentious and non-contentious mandates across the sector. The team is highly regarded by public and private sector clients, ranging from multinational pharmaceutical giants to pan-European associations and sovereign states. Praised by clients as an ‘exceptional legal advisor‘, Catherine Longeval routinely represents various heavyweight clients in high-profile litigation and CEPANI-governed arbitral tribunals. Peter L’Ecluse‘s life sciences expertise is concentrated in patent licensing, registration, and pricing reimbursement, representing entities in various administrative proceedings. Also noted for his EU competition expertise, Michael Clancy‘s recent disputes-based instructions include appearances before the Court of Justice appealing patent settlement verdicts. Koen T’Syen and Thibaut D’hulst are other names to note.

Belgium > Dispute resolution

Van Bael & Bellis maintains an active dispute resolution practice that encompasses corporate litigation, distributorship disputes, damages litigation, and other public tender matters for a client base that includes a strong roster of blue-chip multinationals and pharmaceutical companies. Practice head Catherine Longeval acts for many of the firm’s most high-profile clients, and is experienced in distribution law, product liability, and CEPINA-governed arbitration. Peter L’Ecluse is noted for his broad expertise in life sciences litigation, variously appearing before the administrative courts, the Council of State, and the Belgian Competition Authority. Koen T’Syen routinely appears before the Belgian civil and administrative courts, and is particularly experienced in cartel damages claims.