an Invision Productions Limited production in association with Heights Productions, Inc. and WGBH Boston, with the assistance of Lion Television Limited ; produced and directed by William Cran ; written by William Cran, Daniel Yergin ; executive producer, Michael Sullivan
WGBH Educational Foundation ; produced and directed by Ben Loeterman ; written by Ben Loeterman and Alex Kotlowitz ; a Frontline coproduction with Ben Loeterman Productions, Inc