Marteau LS (Legal Services) was founded in 2024 by Jeroen den Hamer. Marteau LS primarily serves corporates, investors, lenders, and (high-net-worth) individuals and operates in various legal areas.


Jeroen den Hamer

Founder, lawyer


Jeroen has been active in legal services for over 20 years, including approximately 14 years as a lawyer at the Amsterdam Zuidas business district. In 2012, he worked in London.


Jeroen studied at Utrecht University, University of Amsterdam and Nyenrode Business University.


Jeroen has extensive experience guiding and Corporate/M&A and financing transactions, structuring innovative financial products and services, and assisting license application processes (and disputes) in this regard, both for market participants and regulators. He has primarily litigated in the field of financial law. Jeroen has specialized knowledge of FinTech and AI.


With his knowledge, experience, and broad perspective, he's a valuable sparring partner and trusted advisor. As one of the first employees of a large internet pioneer, he has a special interest in IT and AI.


Legal500 described Jeroen as "knowledgeable". Clients said: "he is very dedicated and in touch with our needs as clients. He has an in-depth understanding of how the financial markets operate and translates that to accurate, in depth and practical legal regulatory advice” en: “I think he’s very client-oriented. He’s basically able to sketch out the main alternatives fairly briefly and in an understandable way.”


Jeroen regularly writes for the Dutch legal journal Rechtspraak Aansprakelijkheids- en Verzekeringsrecht and is a writer for Onderneming en Financing,


A selection of his publications in various magazines can be found elsewhere on this website.