Diederik van der Kooij

Diederik specialises in dispute resolution, with a particular emphasis on liability law, collective redress, consumer rights law, contractual disputes, and Supreme Court litigation. He has been involved in several of the largest collective disputes in the Netherlands. As a Supreme Court lawyer, he represents clients in cassation and preliminary ruling proceedings, and helped shaping landmark decisions in liability law, insurance law, procedural law and consumer rights law.

Diederik earned his Ph.D. from Erasmus University Rotterdam, where he wrote a dissertation titled 'Relativity, Causation, and Remoteness of Damage', exploring the limits of contractual and tortious liability. He has authored several publications, primarily on tort law and collective redress, and regularly lectures on these topics. Diederik is editor of the authoritative commentary on the law of damages ("Groene Serie Schadevergoeding") on the topics causation and remoteness.

Diederik has registered the principal (and secondary) legal practice areas Civil Procedural Law in the Netherlands Bar's register of legal practice areas (rechtsgebiedenregister). Based on this registration, he is required to obtain ten training credits per calendar year in each registered principal legal practice area in accordance with the standards set by the Netherlands Bar.

Expertise areas

Collective redress & Cartel DamagesSupreme Court Litigation