Bachelor of Science, Groningen University, The Netherlands, 1962. Master of Science, Utrecht State University, The Netherlands, 1967. Master of Science, Iowa State University, 1970.
Doctor of Philosophy, Iowa State University, 1972. Habilitation, Georg-August University, Goettingen, Germany, 1979.
Research associate Iowa State University, Ames, 1968—1972. Research soil scientist Georg-August University, 1972—1981. Professor soil science Hohenheim University, Stuttgart, Germany, 1981—1991, University Hannover, Hannover, Germany, 1991—2005.
Visiting professor Iowa State University, 1989, Martin-Luther University, Halle/Saale, Germany, 1993—1994.
Fellow: Soil Science Society of America (Emil Truog award 1973), American Society Agronomy. Member: American Geophysical Union.
Married Mechtilde Hermine Vrijling (divorced ). Children: Welmoed, Eline, Philip. Married Maria Elisabeth Marquardt.