About DeHaan

For more than 127 years DeHaan Advocaten en Notarissen has assisted companies, institutions and government bodies in a wide range of legal issues. With our sector approach, market thinking is embedded in our organisation. We integrate our knowledge of sectors such as Waste, Environment & Energy, the Manufacturing Industry, Trade, Transport & Logistics, Care, Education, Construction & Property, and Agri into our services and are thus able to provide targeted advice.

We think along as trusted advisors, keep a clear view on developments and are extremely involved. 


Over the years, DeHaan Advocaten en Notarissen has transformed from a sole proprietorship into a leading full-service law firm.

Together with 130 enthusiastic colleagues, we work from Groningen, Assen, Leeuwarden, Stiens and Zwolle. From our strategically located offices, we provide legal support to medium-sized and large organisations.

Sector approach

With 70 lawyers and civil-law notaries, we have all specialisations in-house. Knowledge of your sector, which transcends specific legal areas, is bundled into our sectors. Therefore, our teams are fully aware of what is going on in your sector.

Our mission and vision

Mission: DeHaan aims to make companies and institutions stronger

What role do we want to play for our clients? DeHaan wants to support companies and institutions with the best legal assistance. We believe this starts with attention and commitment. That is why we focus on and understand the challenges, questions, doubts and problems of entrepreneurs.

Any organisation that has its affairs in order legally runs fewer risks in its day-to-day operations and is better prepared for constant changes in (inter)national legislation and regulations.

Vision: Legal concern

We help people and companies the way they prefer to be helped. We believe that the best legal assistance starts with above average interest and involvement, and that attention connects.

Maximum client satisfaction makes us proud and gives us energy. It is what drives us and connects us. We distinguish ourselves with our enterprising, customer-oriented and proactive mentality. Now and in the future!

Sharing our knowledge

How do we translate this vision into practice? And how do you engage us without incurring unnecessarily high legal fees? We do this as follows: we focus on developing our clients’ knowledge. By regularly organising generally accessible or specifically client-oriented in-depth sessions, the knowledge within your organisation is kept up to date and you only engage us when necessary.

The board

The board consists of Ali Ben Daoued (lawyer) and Mark Jonker Roelants (civil-law notary).

We distinguish ourselves from other offices by our constant attention to the quality of the relationship with our clients, in all its facets. The attention for the relationship is further enhanced by the physical presence of offices in the region and the specialisation in market segments.

DeHaan is known for its high client satisfaction and excellent service; the client is our central focus. At DeHaan we believe that the best legal assistance starts with an above average involvement. For our clients, we provide top quality advice and solutions. Maximum client satisfaction creates pride and energy; it is what drives us and connects us.

CSR and sustainability

One of the ways in which we do business is as a social enterprise:

We encourage electric vehicles; charging points are available at every office. An OV business card for employees makes travelling by public transport attractive. Our office is closely involved in a variety of organisations and initiatives in the field of sustainability, such as Circular Fryslân.