Master of Science, Wageningen University, 1974. Doctor of Philosophy, Wageningen University, 1978. Master in Public Health, University Minnesota, 1981.
Assistant professor, associate professor, professor University Leiden, Netherlands, 1977—1988. Head department epidemiology National Institute Public Health and Environment, Bilthoven, Netherlands, 1988—1991, director public health research division Netherlands, 1991—2001, director nutrition and consumer safety division Netherlands, since 2002. Chairman programme committee for a national research program on weight control Netherlands Heart Foundation, since 2001, chairman science committee on prevention, since 1998.
Chairman nutritional surveillance committee Nutrition Council, 1992—1998. Member governing council International Agency Research on Cancer World Health Organization, Lyon, since 2001. Member Health Council, The Hague, since 2003.
Married Gerda de Leeuw, April 9, 1974. Children: Joost, Linda.