Research assistant University Giessen, Federal Republic Germany, 1968-1971. Professor University Wuppertal, Federal Republic Germany, 1971-1977. Professor economics University Duisburg, Federal Republic Germany, since 1977.
Chairman Radein Association Comparative Economic and Social Systems, Marburg, 1988-1997.
- Author: Japan-A Pharmaceutical World Power?, 1987, Stabilization Policy, 1989. Editor: Inflation and Shadow Economy in CPEs, 1988, Economic Systems in Transition, 1990, China's Contemporary Reforms as Development Strategy, 1990, 50 Years of Social Market Economy, 1998, European Integration, 1998, Perspectives of Systems Analysis, 1999, Regional Integration and Eastern Eularoement of the European Union, 2003, European Health Systems, 2003, Stabilization Problems in Market Economies, 2003.