- University of Groningen: private law
- University of Amsterdam: public law
- Grotius: Company Law and Business Law
Maartje de Jong has registered the following principal (and secondary) legal practice areas in the Netherlands Bar’s register of legal practice areas (rechtsgebiedenregister):
Based on this registration, Maartje is required to obtain ten training credits per calendar year in each registered principal legal practice area in accordance with the standards set by the Netherlands Bar.