Metropolitan Kallistos of Diokleia (Timothy Ware) was the Spalding Lecturer in Eastern Orthodox Studies at Oxford University for thirty-five years until his retirement four years ago. Educated at Westminster School in London and at Magdalen College, Oxford, where he took a double first in classics and then studied theology, he joined the Orthodox Church in 1958. He studied at Princeton University on a graduate fellowship and went on to earn a D.Phil. from Oxford in 1965, the same year he was ordained a deacon and given the new name of Kallistos. In 1966, the year he joined the Oxford faculty of theology, he was ordained to the priesthood. He took monastic vows at the Monastery of St. John the Theologian in Patmos, Greece, and remains a member of that community. After founding the Greek Orthodox Parish of the Holy Trinity in Oxford, Bishop Kallistos was promoted to the rank of archimandrite. In 1970, he was named a fellow of Pembroke College. In 1982, he was consecrated titular Bishop of Diokleia, the first Englishman to become a bishop within the Orthodox Church since the eleventh century, and appointed one of the assistant bishops of the Orthodox Archdiocese of Thyateira and Great Britain under the Ecumenical Patriarchate of Constantinople. In 2007, he was elevated to titular Metropolitan of Diokleia. He served as chair of the board of Oxford’s theology faculty from 1992 to 1994. Long active in the work of Christian unity, Bishop Kallistos was a member of the Anglican-Orthodox Joint Doctrinal Discussions for eleven years, and for much of that period, he served as the Orthodox theological secretary to the commission. He also has served as the Orthodox co-chair of the Preparatory Commission for the Orthodox-Methodist Theological Dialogue. A moderator of the Ecumenical Society of the Blessed Virgin, he is a vice president of the Fellowship of St. Alban and St. Sergius and serves as a member of the editorial committee of the fellowship’s journal, Sobornost. He was formerly an editor of the Eastern Church Review. In addition to publishing articles in scholarly journals, Bishop Kallistos is the co-translator of two Orthodox service books and of The Philokalia, a collection of texts written between the fourth and fifteenth centuries by Orthodox spiritual masters. He is the author of eight books, including The Orthodox Church (1963; revised edition 1993), a work considered throughout the English-speaking world as the standard introduction to Eastern Orthodox Christianity. Two of a projected six volumes of his collected works have been published by St. Vladimir’s Seminary Press, The Inner Kingdom (2000) and In the Image of Trinity (2006).