The U.K.'s Telegraph today published an obituary for Henry Chadwick, the prolific Anglican historian of the Early Church. The Telegraph describes him as "a man sympathetic to, and very well acquainted with, the Roman Catholic Church; a traditionalist who appeared to adhere to no particular group within Anglicanism; and an advocate of ecumenism whose actual sympathies lay tantalisingly beyond sight."
The Times Online also has an obituary.
His extensive works on patristics and Church History include works accessible and understandable to undergraduates and those with no formal education in the subject, yet respected by academics of the highest level for his historical expertise. Few English-speaking people -- whether Catholic, Anglican, Protestant or Orthodox -- have learned Early Church history in the past few decades without being influenced by his work. These are some of his books:
Origen, Contra Celsum (translated by Henry Chadwick)