Prof. Georgios Martzelos was born in Thessaloniki. He studied Theology, History and Philosophy in the Universities of Thessaloniki, Athens and Heidelberg. He is Professor in the Theology Department of Aristotle University of Thessaloniki and teaches Dogmatic Theology. His scientific work in Greek, German, English, Italian and other languages counts more than 140 studies. His most important works are:

• Essence and Energies of God according to St. Basil the Great, Thessaloniki 1984 (in Greek).
• Origin and Sources of the Definition of Chalcedon, Thessaloniki 1986 (in Greek).
• The Christology of Basil of Seleucia and its ecumenical meaning, Thessaloniki 1990 (in Greek).
• Orthodox dogma and theological problematics. Studies of dogmatic theology A΄, Thessaloniki 1993 (in Greek), B΄, Thessaloniki 2000 (in Greek), C΄, Thessaloniki 2007 (in Greek), D΄, Thessaloniki 2011 (in Greek).
• Orthodoxy and modern Dialogues, Thessaloniki 2008 (in Greek).
• "...ο νόμος σου μελέτη μου". Μελετήματα ορθοδόξου θεολογίας και προβληματισμού, Thessaloniki 2015 (in Greek).