produced for NOVA by BBC for WGBH Boston ; produced and directed by Guy Smith ; series producer (BBC), Zoe Heron ; managing director (NOVA), Alan Ritsko
produced by Dan Edge, Sasha Joelle Achilli ; directed by Dan Edge ; Frontline executive producer, David Fanning ; a Frontline production with Mongoose Pictures and Quicksilver Media in association with the BBC ; WBGH Educational Foundation