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
a BBC/WGBH Boston/ProSieben co-production [in association with France 3 ; produced and directed by John Hayes Fisher ; produced for Nova by Gary Glassman ; senior executive producer, Paula S. Apsell