Doctor of Science, State University Groningen, 1983. Doctor of Philosophy, State University Groningen, 1986.
Research scientist Philips Research, Eindhoven, The Netherlands, 1986-1989, Aachen, Germany, 1989-1996, senior scientist, 1996-2001, research fellow, since 2001. Professor materials science Utrecht. University, since 2001.
Lecturer International School on Atomic and Molecular Spectroscopy, Ettora Majorana International Center for Science Culture, Erice, Italy, director international workshop on luminescence.
Member Electrochemical Society, Inc. (chairman luminescence science and display materials division 1999-2001), European Rare Earth Society.
Married Sietske Horneman, January 23, 1981. Children: Anna Gezina, Mirte Eline, Jacob Pieter.