German Society of Plastic and Reconstructive Surgery (Deutsche Gesellschaft für Plastische und Wiederherstellungschirurgie; DGPW) (corresponding member) 2005
German Society of ORL/H&N (corresponding member) 1998
American Academy Otolaryngology‑Head&Neck Surgery (corresponding member) 1996
European Laryngological Association 1995
European Study Group for Functional Surgery Following Laryngectomy (EGFL; founding member) 1993
Dutch Head and Neck Oncology Cooperative Group 1984 (board member 1988‑1996)
American Head and Neck Society (corresponding member of both founding societies) 1984
Eye and Orbita Tumor Committee (National Cancer Committee) 1980-2000
Netherlands Oncology Society 1979
British Association for Head and Neck Oncology (corresponding member) 1979
Netherlands Society of Oral and Maxillo‑Facial Surgery (associated member) 1979
Netherlands Society of Oto-Rhino-Laryngology and Cervico‑Facial Surgery 1978
