Dick Barendregt finished dental school in 1988 at the Rijksuniversiteit of Groningen. He worked as dentist in the Royal Dutch Navy en several private practices for a period of 5 years. In 1991 he started his Master of Science training in periodontology at the University of Amsterdam. After finishing his training in 1994 he worked as periodontist in 2 referral clinics  restricted to periodontology. In 1996 he founded his own clinic in Rotterdam. In his clinic he works as a specialist in periodontology and implantology. The last 15 years the emphasis in patient treatment has been on the interdisciplinary planning (Proclin) together with endodontists, orthodontist, prosthetic dentist, dental technicians and oral surgeons. He is cofounder of the EndoRotterdam en PRORotterdam. Both clinics are closely related to the Clinic for Periodontology and are addresses for dentists to refer their patients to either endodontists or prosthetic/reconstructive specialists. From 1995 to 2001 Dick Barendregt was on the board of the Dutch Society of Periodontology (NVvP) as treasurer. In this period he was the representative for the Netherlands with the EFP. After that period he joint the board of the Rotterdam Dentist Society for 10 years. Since 2009 he is member of the board of National Board on Quality of Postgraduate Dental Education. Dick Barendregt works since 1994 with the Department of Periodontology at the University of Amsterdam and lectures in the Postgraduate Program in Periodontology. November 4th 2009 he received his PhD degree on his thesis “Probing around teeth”. He also lectures in both national and international meetings.

In 1994 Edwin Eggink graduated in dentistry, to become an endodontist in 1997, both at ACTA Amsterdam. Until 2009 he combined his general practice with endodontic referrals. After that he founded EndoRotterdam, a clinic limited to referrals only which employs several endodontists. There is a close interdisciplinary relationship with the periodontal clinic (ParoRotterdam) and the restorative clinic (PRO-Rotterdam).

Manfred Leunisse finished his dental school in 1987 at the University of Amsterdam. For one and a half year head did research at the department of orthodontics at het Free University of Amsterdam. In 1989 he started his post-graduated training at the Academic Centre for Dentistry in Amsterdam where he finished his training in January 1993. In march 1993 he founded his own orthodontic practice in Rotterdam. Besides his practice he is giving postgraduate courses for dentists. Since 1997 the interest has shifted to patients treated in a interdisciplinary team (Proclin) together with Dick Barendregt and with prosthodontists, periodontologists, endodontologist and oral surgeons. He also lectures in both national and international meetings.

Marcel Linssen got his doctoral degree in dentistry at Utrecht University in 1988 and finished his Dental examinations at the Catholic University of Nijmegen in 1989. From 1991 onwards he was one of the founding fathers of a large general dental clinic in Rotterdam. From 2012 onwards he is working at PRO-Rotterdam, a reference clinic for prosthodontics and restorative dentistry, and PROCLIN, a clinic for the interdisciplinary treatment of dento-alveolar trauma, amelogenesis imperfecta, oligodontia, treatment of wear in combination with orthodontics and autotransplants.