Panayiotis Tzamalikos is Professor of Philosophy at the Aristotle University of Thessaloniki. His main research interests include the relation and interplay between Hellenism and Christianity, the roots and evolution of Christian doctrine from its origins until the ninth century, classical and late antique philosophy and its influence on Christianity, the influence of Christian thought on Neoplatonism, patristic theology, and the real import of Origenism and its various implications, from Origen's death up until the late sixth century.