 In 1969 he founded The Boydell Press, which later became Boydell & Brewer Ltd, a publisher in medieval studies, and acted as group managing director until 2009.In 1989, Boydell & Brewer Ltd, in association with the University of Rochester, started the University of Rochester Press in upstate New York.In 2016, the directors of Boydell & Brewer Ltd transferred the company into a trust for the benefit of the employees.