Teacher's examination, Teachers Training College, Hamm, Germany, 1968. Diploma in psychology, University Hamburg, Germany, 1973. Doctor of Philosophy, University Hamburg, Germany, 1976.
Doctor honoris causa, Y Kupala University, Grodno, Belarus, 1995.
Assistant professor, Departmennt of Educational Science, University of Hamburg, Germany, 1970-1974. Senior research psychologist, Institute for Primary School Research, University Erlangen/Nuernberg, Germany, 1974-1980. Professor of psychology, University of Augsburg, Germany, 1980. Professor of Psychology, Philipps-University Marburg, Germany, 1981-1985. Professor of educational and developmental psychology (chair), Philipps-University Marburg, Germany, 1995-2010. Director of BRAIN, since 1999.
Visiting professor of educational and psychological research, Institute for Educational Research IEE, Universidad Nacional de La Plata, Argentina, 1989-1991, 1996, 2006. Visiting professor of educational and development psychology, Yanka Kupala University, Grodno, Belarus, 1995. Visiting professor, Faculty of Psychology, Philipps-University Marburg, since 2010. Visiting professor, Faculty of Psychology, Southwest University Chongqing, VR China, since 2013.
Author: (book) Basic Problems of Empirical Research in Education, 1973, Analysis and Evaluation of Empirical Research, 1974, Spatial Ability, 1977, Dimensions of Reading Comprehension, 1985, Interpretation and Evaluation of Empirical Studies in Education and Educational Psychology, 2007, Intelligence, 2009. Editor: German Journal Educational Psychology, since 1987, (book) Behavior Modification in Education, 1975, Developmental Psychology for Primary School Teachers, 1980, Instructional Psychology for Primary School Teachers, 1980, Educational Psychology for Primary School Teachers, 1982, Life Environment Analysis of Highly Gifted Children, 1993, Highly Gifted and Highly Achieving Youth, 2009, Handbook of Educational Psychology, 2010, several book series, —, Diffential Test Anxiety Inventory, 2007. Member editorial committee: Diagnostica.Contributor over 200 articles to science journals, chapters to books.
Member German Psychological Society, Society Empirical Research in Education (president 1993-1995), Humbolt Society.
Married Dorothee K.I. Trebbin, April 10, 1968. Children: Esther Eva, Judith Elisa, Lea Camilla.