Duncan Petrie is Professor in the Department of Theatre, Film and Television at the University of York. He was Director of the Bill Douglas Centre for the History of Cinema and Popular Culture. His books include Creativity and Constraint in the British Film Industry (Macmillan, 1991), New Questions of British Cinema (BFI, 1992), The British Cinematographer (BFI, 1996). Robert Kruger has worked as an editor, director and producer, mainly within the British documentary movement, and set up the TSW Film and Video Archive, now largest regional archive in the country. He started his working life with Paul Rotha's 'Films of Fact' company and edited Rotha's final two films.