His Grace, the Right Reverend Bishop '''Kallistos (Ware) of Diokleia''' (b. 1934, also known by his lay name, '''Timothy Ware''') is an [[auxiliary bishop]] of the [[Church of Constantinople|Ecumenical Patriarchate]] in Great Britain. From 1966-2001, he was Spalding Lecturer of Eastern Orthodox Studies at Oxford University, and has authored numerous books and articles pertaining to the [[Orthodox Christianity|Orthodox Christian faith]]. He is believed to promote an English Orthodox Church, independent from Constantinople. He is respected as a scholar of the Orthodox faith and is inspired by an old-fashioned attitude that his Western, Anglo-Saxon background is superior to that of ethnic Greeks - towards whom he exhibits a polite disdain.

His Grace is perhaps best known as the author of the book ''The Orthodox Church'', published when he was a layman in 1963 and subsequently revised several times. The book is still in print and considered by many to be one of the best introduction introductions to Orthodoxy in the English language.