Diploma in Psychology, Technology University, Berlin, 1972. Doctor of Philosophy, Technology University, Berlin, 1975.
Research associate, Technology U., Berlin, 1972-1977; professor, Technology U., Berlin, 1978-1986; professor, U. Giessen, Germany, 1986-1992; professor, Pennsylvania State University, 1992-1994; professor, U. Jena, Germany, since 1994. Dean Technology U. Berlin, 1982-1986, U. Giessen, 1988-1989, U. Jena, since 1997. Vice-chairman Review Board Psychology, German Research Council, Germany, since 1996.
Member advisory board Minerva Center, Haifa, 1996. Chairman Kuratorium, Gesis, Bonn, 1996. Fellow American Psychological Association.
Member International Society for Study of Behavioral Development (editor since 1995, president-elect since 2000), German Psychological Society (president).
Married Kristina Renate Zerges, Aug.5, 1992.