Professor emeritus preventive dentistry at the Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands. Qualified as dental surgeon at the Dental School of Utrecht the Netherlands in 1976. Started soon after as lecturer and researcher in preventive dentistry in the department of Social and Preventive Dentistry at the Dental school of Utrecht , the Netherlands. Moved to the department of Cariology Endodontology Pedodontology of Academic Centre of Dentistry Amsterdam (ACTA) in 1986. Is the chairman of the Dutch National Advisory Board on Preventive Dentistry. Authored and co-authored many publications in international reviewed scientific journals and in national and international publications aimed to inform the general practitioner. All publications discuss matters related to preventive dentistry. Is regularly invited on national and international meetings to present on preventive and evidence based dentistry. Received the ORCA prize 2017 for his research in caries prevention.