He is the director of the outpatient treatment services of Bouman Mental Health Care (GGZ), location Spijkenisse. Furthermore, he is affiliated faculty at Erasmus University Medical Centre, Department of Forensic Psychiatry in Rotterdam. His Ph.D. dissertation was completed in 2005 at the Department of Clinical Psychology, Vrije Universiteit in Amsterdam, and was entitled "The Community Reinforcement Approach (CRA) and naltrexone in the treatment of addiction". Correspondingly, his interests include behavioral oriented treatments such as CRA, contingency management, and pharmacological treatments related to substance use disorders.