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
a Nova production by Green Umbrella Ltd. for WGBH/Boston in association with BBC-TV and Sveriges Television ; produced by Peter Jones and Thomas Levenson ; written by Thomas Levenson ; directed by Peter Jones
produced by Swedish Television in association with WGBH Boston ; directors and producers, Bo G. Erikson, Carl O. Lofman ; for NOVA, written and produced by Bebe Nixon
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