Doctorandus, University Amsterdam, 1974. Doctor of Philosophy, State University, Groningen, The Netherlands, 1979. Postdoctoral studies, University Nymegen, The Netherlands, 1982.
Postdoctoral studies, State University, Leyden, The Netherlands, 1984. Postdoctoral studies, Utrecht (The Netherlands) University, 1986.
From assistant professor to associate professor Faculty of Veterinary Medicine, Utrecht University, since 1992.
Married Bertha Agatha Huitema. Children: Tineke Laura, Wilma Sybrenne, Klaas Johannes Hendrik.