written & directed by John L. Valadez ; produced by John L. Valadez ; a co-production of John J. Valadez, WGBH/Boston and the Independent Television Service in association with Latino Public Broadcasting
produced by Tangled Bank Studios in association with Holt Productions and Smithsonian Networks ; producer/director, Sarah Holt ; writers, Thomas Friedman, Sarah Holt
a Frontline co-production with RAINmedia, Inc. ; a production of WGBH/Boston ; written and produced by Martin Smith and Marcela Gaviria ; co-produced by Will Cohen
American Experience Films presents ; written by Mark Zwonitzer ; produced and directed by Jamila Wignot ; an Apograph Productions Inc. film for American experience
2 Entertain ; BBC ; BBC Earth ; a BBC/Discovery Channel/France Television co-production ; series producer, Dale Templar ; executive producer, Brian Leith ; BBC Productions Bristol/Wales