- Worked for 10 years at the regional cinema chain Jogchem's Theaters;
- In 1982, was appointed Director of the Amsterdam Concertgebouw;
- Under Martijn´s directorship, the Concertgebouw became the best-attended classical music venue in the world.
- In 2006, left the Concertgebouw to devote himself to his numerous national and international management and supervisory board memberships and advisory roles;
- Also engaged in consultancy projects for cultural management and policy.