| since 1954 | Studies in Law, Economics, Sociology and Philosophy, Universities of Freiburg, Graz and Muenster |
| 1958 | Law First examination (Referendar OLG Hamm) |
| 1963 | Law Second examination (Assessor OLG Duesseldorf) |
| 1960 | Doctorate in Economics, University of Graz |
| 1965 | Doctorate in Law, University of Muenster |
| since 1970 | Editor in Chief, RECHTSTHEORIE. Zeitschrift für Logik und Juristische Methodenlehre, Rechtsinformatik, Kommunikationsforschung, Normen-und Handlungstheorie, Soziologie und Philosophie des Rechts, Duncker & Humblot, Berlin |
| 1974 | Dr. jur. habil. (venia legendi : Public Law, Legal Theory, Legal Sociology), University of Muenster |
| -1979 Professor of Public Law, General Theory of Law and Legal Philosophy, University of Muenster |
| since 1979 | Professor of Public Law, Chair of Sociology of Law, Legal and Social Philosophy, University of Muenster |
| 1981 | - 1982 Dean of the Faculty of Law, University of Muenster |
| since 1981 | Director, Westphalian Academy of Law and Business Administration, Muenster |
| since 1982 | Director, Central Institute of Spatial Planning, University of Muenster |
| since 1990 | German coordinator of German-Russian International Legal Studies, Institute of State and Law, Russian Academy of Sciences, Moscow |
| 2000-2006 | Director, International Centre of German - Russian Legal Studies (IZDRR), University of Muenster |
| 2014 | Mitglied des Vorstandes des Internationalen Zentrums für Recht, Rechtstheorie und Wirtschaftsrecht (IZR), e.V., Muenster |
| | Editor adviser or member of the Editorial Board of more than 20 academic journals, for example , Russian Yearbook of Legal Theory, Saint- Petersburg, and Pravovedenie [Jurisprudence], Saint- Petersburg |
