Interview with Mr Jonathan Marsh, conducted by Professor Tilli Tansey, for the History of Modern Biomedicine Research Group, 14 November 2016, in the School of History, Queen Mary University of London. Transcribed by Mrs Debra Gee, and edited by Professor Tilli Tansey. The project management and the technical support (production and filming) were undertaken by Mr Adam Wilkinson and Mr Alan Yabsley, respectively.