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
written and produced by Barbara Jampel ; executive producers, Dennis B. Kane, Thomas Skinner ; produced by the National Geographic Society and WQED Pittsburgh