Lehrbeauftragte, for teaching modern-Greek language and philology – University of Marburg, Germany (1966–69). He organized and directed the «Center of Missionary Studies» at the University of Athens (1971–76). Associate Professor of History of Religions (1972–76). Full Professor of History of Religions in the National University of Athens (1976–97). Prof. Emeritus (1997 ff.). At the same university: Director of the Department of the Science of Religions and Sociology (1983–86). Dean of the Theological Faculty and member of the Senate (1983–86). Vice-president of the Club of Students. Chairman of the Commission of Solidarity in the Cyprian Struggle (1975–84). Member of the Committee of Research of the University of Athens (1986–1990). and the «Inter-Orthodox Center of Athens» of the Church Greece (1971–75). Member of the Council of the Centre of Mediterranean and Arabic Studies (1978–82).
