Ancillary activities
- Member | Dutch Advisory Council Soil Protection | Remunerated (Personal)
- Member | directing team Expertise Network Soil and Underground (ENBO) | Not remunerated
- Member | Dutch Soil Platform (DSP) | Not remunerated
- vice-chairman | Geochemistry Expert Group of EuroGeoSurveys | Not remunerated
- employee | TNO | Remunerated ()