Master of Science in Chemistry, Free University Amsterdam, 1979. Doctor of Philosophy, Leiden University, Zuid-Holland, Netherlands, 1983. Attending, Leiden University, Zuid-Holland, Netherlands, 1986.
Assistant professor University Amsterdam, 1986—1989. Staff member University Medical Center Utrecht, Netherlands, 1990, assistant professor, department metabolic and endocrine diseases, since 1990.
Son of Jacob van Doorn and Johanna Gaartman. Married Carla Hessels, February 23, 1979. Children: Jaap, Koen, Bob, Britt.