Marek works part-time as Adviser in Houthoff's Dispute Resolution Team. He specialises in private international law in the broadest sense. In addition to working at Houthoff, Marek is a lecturer in international private law at the Faculty of Law in the Vrije Universiteit Amsterdam. He regularly publishes on issues relating to international private law, particularly international procedural law and international company law. He is a regular member of the editorial team of various well-known law journals (Weekblad voor Privaatrecht, Notariaat en Registratie, Tijdschrift voor Civiele Rechtspleging).