- Initiator and coördinator Cystic Fibrosis Center Utrecht
- Member Medical Ethics Committee University medical Center Utrecht
- Chairman Electronic Patient Registree Committee Wilhelmina Childrens’ Hospital
- Chairman Dutch Cystic Fibrosis guideline committee
- Member Advisory Board Dutch Cystic Fibrosis Society
- Member Research Council Wilhelmina Childrens’ Hospital
- Chairman Quality Management Dutch Pediatric Society • Board member Malawi Mission Work Team