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 Bonne Pioche and Greenspace for WGBH/Boston ; produced for Nova by Providence Pictures, Inc. for WGBH/Boston ; producer, Gary Glassman ; writer, Antoine de Maximy ; writer and director, Caroline Wrinch ; directed by Antoine de Maximy
a Mentorn production for Nova/WGBH in association with CBC ... [and others] ; produced and directed by Ben Fox ; 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