Rev. Dr. John Chryssavgis is an author and theologian serving as Archdeacon of the Ecumenical Patriarchate and theological advisor to the Ecumenical Patriarch. He is a clergyman of the Greek Orthodox Archdiocese of America. Born in Australia, he graduated from Athens University and Oxford University. His publications focus on medieval theology, as well as on the history of the Eastern Church. His interests embrace the areas of spirituality and ecology. He co-founded St Andrew’s Theological College in Sydney, where he also taught at the University of Sydney. In 1995, he was appointed Professor of Theology at Holy Cross School of Theology and directed the Religious Studies Program at Hellenic College. He has also taught at the University of Balamand in Lebanon. He has published over thirty books and numerous articles in several languages. He lives in Maine.