HBO Documentary Films presents ; a Passion Pictures & Motto Pictures production ; in association with Artifact Studios ; produced in association with Prettybird Pictures ; a film by Greg Barker ; directed by Greg Barker ; produced by Julie Goldman ... [and others]
National Geographic Television & Film ; a Brando Quilici production ; in association with National Geographic Television and Film for National Geographic Channel ; director, Brando Quilici ; writers, Rob Goldberg, John Bredar
produced by Green Lion Productions, Inc., in association with the Canadian Broadcasting Corporation, with the participation of Telefilm Canada and Société générale des industries culturelles (SOGIC) [and] National Film Board of Canada ; director, Anne Henderson ; writer, Gwynne Dyer ; producers, Marrin Canell, Catherine Mullins