Diarmaid MacCulloch is Professor of the History of the Church, Oxford University.  His History of Christianity: the first three thousand years won the 2010 Cundill Prize; his next book is Sex and the Church, of which his TV series of 2015 was a foretaste.  He was knighted in 2012.  His biography of Thomas Cromwell appeared in 2018 and is now out in paperback.