2014 - 2015Professor, Shanghai University, China
2007-2012Visiting Professor, Open University, Milton Keynes, Great Britain
1978 - 2013Professor, Faculty of Social Sciences, University of Kassel, Germany
2004Visiting Professor, Research Institute for Higher Education, Hiroshima University, Japan
1994 - 1995Dean, Department of Applical Social Sciences and Law, Comprehensive University of Kassel, Germany
1978 - 2004Director (for 14 years), Centre for Research on Higher Education and Work, University of Kassel, Germany
1994 - 1996Professor (part-time), College of Europe, Brugge, Belgium
1986 - 1992Professor (part-time), School of Education and Social Policy, Northwestern University, Evanston, Illinois, U.S.
1992 - 1993Fellow of the Special Exchange Programme between Japan and Europe, provided by the Japanese Foreign Ministry, at Nagoya University, Japan
1985 - 1986Fellow, Netherlands Institute for Advanced Study in the Humanities and Social Sciences, Wassenaar, Netherlands
1982 - 1983Visiting Professor, University of Educational Sciences, Klagenfurt, Austria
1980 - 1982Vice-president, Comprehensive University at Kassel, Germany
1968 - 1978Research Fellow, Max-Planck-Institute for Educational Research, Berlin, Germany
1973 - 1977Lecturer (part-time), Institute for East Asian Studies, Free University of Berlin, Germany
1970 - 1972Fellow, Japan Society for the Promotion of Science; Guest Researcher, National Institute for Educational Research, Tokyo, Japan
1968 - 1970Lecturer (part-time), Department of Sociology, Free University of Berlin, Germany
1964 - 1968Independent Research Fellow (part-time), Max-Planck-Institute for Educational Research, Berlin, Germany