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.

Specialty area 

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

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 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.”

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