In the context of transparency and a joint agreement between all universities, an overview of all professors and their ancillary activities is available.
Hoogleraren-met-eventuele-nevenfuncties-versie21032024.pdf
Overview professors and their ancillary activities (only in Dutch).
The ancillary activities can also be found on the personal pages of professors:
There is also an overview of all professors by special appointment with chairs, organizations involved and funding: