A. Rupert Hall (1920-2009) was Professor of the History of Science and Technology at Imperial College, London and a former director of the Wellcome Trust. He wrote widely on the history of science and edited and translated numerous unpublished works by scientists including Isaac Newton.
Norman A. F. Smith (1938-2009) was Reader in the History of Science and Technology at Imperial College, London. He is the author of several works including Man and Water: A History of Hydro-Technology and A History of Dams.