PBS ; produced and directed by Riva Freifeld ; written by Ken Chowder ; co-produced by Amy Brown ; a Riva Productions film for American Experience ; WGBH Boston
director, Glenn Holsten ; producer, Chayne Gregg ; writers, David C. Brock, Glenn Holsten, Arnold Thackray ; a Freshfly production for the Chemical Heritage Foundation
produced and written by Gregory Henry ; directed by Peter Schnall, Gregory Henry, David Shadrack Smith ; series producer, Stephen Stept ; produced by Partisan Pictures for the History Channel