Doctor of Medicine, University Cologne, 1967.
Collaborator Hegel Archives, Bonn, Federal Republic of Germany, 1967-1968, Bochum, Federal Republic of Germany, 1969-1976. Professor Institute for Philosophy, University Bochum, 1977-1980, Institute for Philosophy, University Siegen, Federal Republic of Germany, 1980-1983. Professor, co-director Institute for Philosophy and Husserl Archives, University Cologne, since 1983.
Expert Deutsche Forschungsgemeinschaft, Bonn, since 1984.
Member International Hegel Vereinigung.
Married Edith Kallert, August 23, 1977.