Nick Hall lectures in film, television and media technologies at Royal Holloway, University of London. His first book, The Zoom: Drama at the Touch of a Lever, was published in 2018. He has also been published in the journals Technology & Culture and the Historical Journal of Film, Radio and Television.

John Ellis is a professor at Royal Holloway, University of London. He wrote Visible Fictions (1982), Seeing Things (2000) and Documentary: Witness and Self-Revelation (2012). Between 1982 and 1999 he ran the independent production company Large Door, making documentaries for Channel 4 and the BBC.