Specialist in the Middle Ages and Renaissance – lectures for Oxford University’s Department of Continuing Education. He is Honorary Secretary of the British Archaeological Association, for whom he has edited and contributed to collections of essays on mediaeval cloisters, chantries, Anjou, and King’s Lynn and the Fens. In 2010 he established a biennial series of international conferences on Romanesque visual culture. His most recent effort in this field – Romanesque Patrons and Processes – was published in 2018. He is also author of the Blue Guides to both Normandy and the Loire Valley.