National Geographic Documentary Films presents ; a Terra Mater Factual Studios production ; in association with Appian Way, Malaika Pictures, the Wild Lens Collective ; a film by Richard Ladkani ; directed by Richard Ladkani ; produced by Walter Köhler, Wolfgang Knöpfler
a NOVA production in association with Night Fire Films and ARTE France ; written and directed by David Lebrun ; produced for Nova and narration by Sarah Holt ; produced by Rosey Guthrie and David Lebrun ; edited by Nathan Hendrie, David Lebrun, and Eric Marin
produced by Story House Productions Inc. and Thirteen Productions LLC for WNET in association with ZDF, Arte and ZDF Enterprises, GmbH ; writers, Andreas Gutzeit, Alexander Ziegler ; directed by Jen Afflerbach, Saskia Weibheit ; produced by Alexander Ziegler, Andreas Gutzeit, Jens Afflerbac
Art21 presents ; a production of Art21, Inc. ; directors, Deborah Dickson, Stanley Nelson, Pamela Mason Wagner ; producers, Veronique Bernard, Ian Forster, Nick Ravich
coordinación general: Martín Almaraz Moreno ; investigación, Francisca Miranda Silva ; diseño y programación, Hector Alberto Figueroa C. ; realizado por el Canal 22
PBS ; a production of KERA ; produced in association with Once TV-Mexico City ; produced by Andrea Boardman, Ginny Martin, Rob Tranchin ; written by Rob Tranchin ; directed by Ginny Martin