Passionate Productions for BBC ; produced for NOVA by Holt Productions, LLC ; WGBH Boston ; produced and directed by Jemima Harrison and Sarah Holt ; writer for the BBC, Jemima Harrison ; executive producer for the BBC, Richard Klein ; senior executive producer, Paula S. Apsell
a Nova production by Green Umbrella Ltd. for WGBH Boston in association with BBC-TV, NDR International, Hamburg and Wild Media ; written and directed by Nick Upton ; producers, Peter Jones and Nick Upton
directed, written, and produced by Robert Stone ; a Robert Stone film for PBS/American experience in association with BBC ; WGBH Educational Foundation and Robert Stone Productions