He is (co)author of around 500 international peer reviewed scientific publications and acts as a reviewer for several scientific journals and international research funding organisations. For his research related to clinical pharmacy he received the 'Huizinga penning'.

He is a member of the editorial board of the journal Drug Safety. He is member of several committees such as the CCMO, the Netherlands Expertcenter for Pharmacotherapy for older people (EPHOR), and the advisory board of the Dutch Association of Hospital Pharmacists.

His research activities focus on a) the clinical pharmacology / clinical pharmacoepidemiology of drugs used in daily clinical practice, and b) on innovations in clinical pharmacy systems. In addition, he tries to promote sustainability in pharmacy ('green pharmacy').