During 2014-2015 he was guest lecturer and researcher at the Centre for Terrorism and Counterterrorism (CTC) at the Campus the Hague Faculty of Leiden University. From 2000-2015 he was a forensic scientist at the Netherlands Forensic Institute. In 1998 he obtained his PhD in Econometrics at Maastricht University on the thesis Dynamic Panel Data Models Theory and Macroeconomic Applications. From 1997 to 2000 he was Assistant Professor Statistics/Econometrics at Tilburg University and CentER.