produced in association with Cream Productions Inc. for National Geographic Television & Film also in association with ZDF, ZDFE, France 5, BBC ; producer & director, Christopher Rowley ; writer, Michael W. Sheehan
2 Entertain ; BBC ; BBC Earth ; a BBC/Discovery Channel/France Television co-production ; series producer, Dale Templar ; executive producer, Brian Leith ; BBC Productions Bristol/Wales
a Robert Kenner Films production for American Experience in association with Wisconsin Public Television, Playtone, and the BBC ; producer/director, Robert Kenner ; story, Allen Rucker and Paul Taylor ; telescript, Allen Rucker