Olivier (O.R.) baron van Hardenbroek van Ammerstol

Attorney at law/partner

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Olivier has been a lawyer since 1994 and has been a partner at Delissen Martens since 1 January 2010.

He has extensive experience in advising enterprises and private persons and is specialized in procedural law, business-law disputes and information technology law.

What is the motivation that drives him as a lawyer?

His drive is to achieve the best possible result for his clients. In addition, he finds the analytical and social aspects of the legal profession an interesting combination.

Through his experience and expertise he knows in what way the interests of his client can be represented in a legally proper manner. “A good lawyer does not only know how to interpret the feelings and emotions of a client, he must also be a good legal expert to be able to do so.”

Olivier finds it important that his clients have realistic expectations about a case. He pursues this by being honest and transparent. “At the start of a case, I make clear what is feasible. That way the client is well aware of what he or she can expect from a case.”

His approach? He has a well-considered approach. “In preparation of an advice I always first carry out a preliminary study so that all the facts are set out. When I give advice I always check whether the client understands the approach and supports the strategy.”

Olivier’s advice is solution-oriented. “I have a practical attitude. My criterion is to solve problems and not aggravate them.”

Olivier characterized in three words

Creative, emphatic, analytic

Curriculum of Olivier


  • Mediation, CVC Haarlem, 2007
  • University of Leiden, 1993
  • Université de Poitiers, 1991- 1992 

Professional Associations

  • Dutch Association of Debt-Collection Lawyers (Vereniging Incasso Advocaten – VIA)
  • candidate for membership in the Netherlands Association of Computer Lawyers (Vereniging Informaticarecht Advocaten – VIRA)
  • Dutch Association of Litigation (NVvP)
  • Union Internationale des Avocats (UIA)


English, French, Dutch