• chairman of the Dutch Pharmacological Society (1990-1996) and
• member of the German and American Pharmacological Societies, member of the board of the European Federation of Pharmacological Societies and the European Council for Blood Pressure and Cardiovascular Research.
• Member of the Scientific councils of the Dutch Heart Foundation, the Dutch Kidney Foundation, the Dutch Medical Research Council, the Radboud Foundation, and the Dutch Health Council and the Committee on Medicines of the Sick Fund Council.
• Consultant for several biotech and pharmaceutical companies in the USA, Japan and Europe.
He is member
• Since 1998 of the "Hollandsche Maatschappij der Wetenschappen".
• International fellow of the American Heart Association
• Doctor Honoris Causa of the University of Liege.