Diarmaid MacCulloch, born in 1951, is an English historian and one of the most authoritative voices anywhere on the history of Christianity. The academic credentials are formidable: a fellow of St Cross College, Oxford since 1995, Professor of the History of the Church at Oxford from 1997 to 2019, and since 2020 a senior research fellow and archivist at Campion Hall, with a seat on the editorial board of the Journal of Ecclesiastical History.
What makes MacCulloch unusual is his position relative to his subject. Ordained a deacon in the Church of England, he declined to proceed to the priesthood because of the church’s attitude to homosexuality, and he has since described himself as a candid friend of Christianity – close enough to understand it from within, detached enough to tell the truth about it. That stance, sympathetic but unsparing, is exactly what his readers prize.