James W.P. Campbell MA, PhD, FSA, IHBC RIBA, is currently the Head of the Department of Architecture at the University of Cambridge and the Seear Fellow in Architecture and History of Art at Queens' College, Cambridge. He is chairman of the Construction History Society and on the editorial panel of the Journal of Architectural Conservation. His previous books include Brick: A World History (2003), Building St Paul's (2007), The Library: A World History (2013) and in the current series he co-edited with Michael Tutton Staircases: History, Repair and Conservation (2014).

Michael Tutton, FSA, IHBC, has some 30 years' experience, largely in the construction industry, working principally on historic buildings as a site manager, clerk of works and consultant. He is past chairman of the Society for the Protection of Ancient Buildings and is a Trustee of the Construction History Society. He currently divides his time as assistant architectural adviser to Hampstead Garden Suburb Trust and as an independent scholar writing and editing. He is co-editor of the two previous books in this series, Windows: History, Repair and Conservation, with Elizabeth Hirst and Staircases: History, Repair and Conservation, with James W. P. Campbell.