In The International Who's Who of Public Procurement Lawyers, Maarten has been listed as 'one of the leading practitioners in this field' for quite a few years now - which is not very surprising, as Maarten has built up considerable expertise at Pels Rijcken with Construction and Procurement Law. His practice is very varied, but the emphasis lies on full-service supervision of complex procurement cases in various fields (ranging from infrastructural projects to group insurance policies). He also regularly assists in procurement and construction disputes, both in arbitration cases and before the civil courts. He also holds permanent lecturing posts at the Law Academy of the VU University Amsterdam and the Grotius Academy. His clients include almost all departments of the State and many local and regional authorities.