- Assistant scholar University Heidelberg, 1958-1964, lecturer, 1964-1967. Professor ordinarius, director institute University Kiel, Germany, 1968-1973. Full professor emeritus classics University Mainz, Germany, since 1974.
- Author: Lactantius and Gnosis, 1961, Venus in Vergil's Aeneid, 1967, On Human and Divine Things (Collected Academy Papers), 1990, Illustrated Vergil Manuscripts: Reception and Exegesis, 1998, P. Vergilius Maro: Commentary to the Facsimile-Edition of Manuscript 837 of the University in Valencia (Spanish and German versions), 2001. Editor: Roman Imperial Cult, 1978, Lactantius, Epitome, 1994. Co-editor: Augustinus-Lexikon, since 1986.