Alan Kreider (PhD, Harvard University) is professor emeritus of church history and mission at Anabaptist Mennonite Biblical Seminary in Elkhart, Indiana. For many years he lived in England, where he was director of the London Mennonite Centre and later director of the Centre for Christianity and Culture at Regent's Park College, Oxford University. Kreider has authored several books, including "The Change of Conversion and the Origin of Christendom "and "Worship and Mission after Christendom".