First vice-president of the International Union of Judicial Officers (UIHJ). Treasurer of the International Institute of Justice Excellence. Enforcement agent in the Netherlands.
During the past 25 years, Uitdehaag has been mainly active as a legal reform and legal drafting expert in numerous countries both within and outside Europe, mainly in the field of enforcement law (for European Commission, IMF, World Bank, EBRD, USAID). Currently active in Western Balkan region, Azerbaijan, Mongolia, Laos and EU member states (on privacy).
He has been active as a lecturer at the Dutch University of Applied Sciences in Utrecht, the Netherlands, Prishtina State University and as a guest lecturer at different universities and judicial academies.
He is a reporter of the Project Fiduciary Access to Digital Assets of the European Law Institute; was a project member of the Blockchain and smart contracts project team (also European Law Institute). He is an observer member of the Unidroit project on principles for effective enforcement.