A specialist in the political structures and ideas of later medieval England, William Mark Ormrod, DPhil (Oxon), FSA, FRHistS, was a Professor in the Department of History and Dean of the Faculty of Arts and Humanities at the University of York. He was a fellow of the Royal Historical Society and of the Society of Antiquaries, served on a number of AHRC committees, was a Trustee of the Richard III and Yorkist History Trust, a Councillor of the Pipe Roll Society, and a former Councillor of the Royal Historical Society.

Chair of the British Academy English Episcopal Acta Project and a member of the Comitato Scientifico of the Datini Institute, Prato, Mark was a former general editor of York Medieval Press, a member of the editorial board of the Yorkshire Archaeological Journal and a co-editor of Fourteenth-Century England.