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
written and produced by Martin Williams ; directed by Lara Acaster, Alex Williams ; produced for Nova by Joseph McMaster ; a Pioneer Productions film for Nova/WGBH and Channel 4 ; WGBH Educational Foundation
a Nova production for WGBH/Boston and Channel 4 in association with David Hickman Films, Sveriges Television, and Norddeutscher Rundfunk ; writers, Julia Cort and Brian Greene ; directors, Julia Cort and Joseph McMaster