A production of The Documentary Guild in association with WGBH Boston for Nova ; WGBH Educational Foundation ; Executive editor, William Grant ; executive producer, Paula S. Apsell ; written, produced and directed by Rob Whittlesey and Noel Buckner
a Nova production by New Wrinkle, Inc. ; WGBH Educational Foundation ; written and directed by Joseph Seamans ; produced by Joseph Seamans [and] Janet Driscoll Smith
a WGBH production in association with the British Broadcasting Corporation for NOVA ; produced & directed by Carl Charlson ; written by David McCullough
a Nova/WGBH, La Cinquième, Südwestrundfunk, Gedéon Programmes, Meridian, and NHK co-production ; produced for Nova by Providence Pictures, Inc. for WGBH/Boston ; written and directed by Liesl Clark