Diederik van der Kooij

Diederik van der Kooij

Advocaat | Counsel


+31 20 605 65 96
+31 6 2248 1563



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Diederik advises on and litigates complex disputes relating to contract and liability law, with a particular focus on the liability of banks, asset managers, accountants and other financial service providers. He is also a Supreme Court lawyer and represents clients in cassation proceedings relating to the full spectrum of civil law. Diederik is a member of the Dutch Association for Procedural Law, the Dutch Association of Liability and Compensation Law and the Dutch Association of Civil Cassation Lawyers. He also lectures on liability law and compensation law at the Law Firm School.

Qualifications & Experience

  • LL.M. Dutch Law (Tilburg University)
  • LL.B. Dutch Law (Tilburg University)

  • Advised the on the Toronto Stock Exchange listed WSP Global Inc., one of the world's leading professional services firms providing engineering and design services to clients in the Transportation & Infrastructure, Property & Buildings, Environment, Power&Energy, Resources and Industry sector as well as offering strategic advisory services, on the acquisition of multidisciplinary consultancy- and engineering firm Lievense


  • Houthoff advised Ballast Nedam on an appeal case against Max Bögl, a former joint venture partner. Ballast Nedam wins court of appeal case against Max Bögl. The Supreme Court has rejected an appeal in cassation, lodged by Max Bögl. For Ballast Nedam this ruling means an elimination of a risk of over 9 million euros, without further financial impact. Ballast Nedam brought action in 2003 against Max Bögl for breach of contract in the tendering stage of three underground stations on the North-South Line.


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