Freelance journalist. Publishes on Follow the Money and Maarten. Published in De Correspondent, NRC Handelsblad, Volkskrant, Vrij Nederland, Varagids, Libelle, HP/De Tijd, Esquire, Informatiebeveiliging en Aedes-Magazine. Trainer at Politieacademie (writing and editing). Co-maker of "Alles onder controle", a series of webtv documentaries on privacy, shown on Limboland.tv.Speaker on privacy and security-issues. For instance at het "Symposium Veiligheid en privacy" organised by Minerva (with Jozias van Aartsen, Theo Bot and Ton van Loon), het "Landelijk Congres Bestuurskunde" and the "Security & crisis management forum", organised by Ernst & Young and TNO, "Compliant en toch secure?" by G4S, annual meetings of police unions ACP and VMHP, and workshops for the International Police Association at Schloss Gimborn (Germany), Belastingdienst, the Centre for Terrorism and Counterterrorism in The Hague.