Ancillary activities
- Member | Ministerie van OCW en Koninklijke Bibliotheek | Remunerated (Personal)
- Bestuurslid | Netherlands Intelligence Studies Association (NISA) | Not remunerated
- Member | KHMW | Not remunerated
- Wetenschapscolumnist | NRC Handelsblad | Remunerated (Personal)
- Member | KNAW | Not remunerated
- Member | Internationaler Beirat | Forschungscampus Mittelhessen | Not remunerated
- Columnist | Historisch nieuwsblad | Remunerated (Personal)
- Member | Adviesorgaan Commandant Landstrijdkrachten | Ministerie van Defensie, landmacht | Not remunerated
- Member | Academia Europaea | Not remunerated
- Trustee | Napoleonic & Revolutionary War Graves Charity | Not remunerated
- Chair | Strategische Adviesraad | TNO | Remunerated (Utrecht University)
- Member | Commissie Vrede en Veiligheid | Adviesraad Internationale Vraagstukken | Remunerated (Utrecht University)
- Member | Sociaal-Wetenschappelijke Raad | Koninklijke Nederlandse Akademie van Wetenschappen | Not remunerated
- Member | Adviesraad | NWO | Not remunerated
- Chair | Radicalisation Awareness Network Academic Board | Not remunerated
- Fellow | Center for Advanced Security, Strategic and Integration Studies | Rheinische Friedrich-Wilhelms-Universität in Bonn | Not remunerated
- External Faculty Member | Institute for Advanced Study (IAS) | Universiteit van Amsterdam | Not remunerated
- Member | Raad voor Geesteswetenschappen | Koninklijke Nederlandse Akademie van Wetenschappen | Not remunerated