by Paul Devlin ; directed, edited, and produced by Paul Devlin ; produced by Claire Missanelli ; a Paul Devlin production in association with BBC, YLE/FST Finland, Discovery Channel Canada, SVT/Sweden
a film by Maria Finitzo ; executive producer, Gordon Quinn ; produced in association with The British Broadcasting Corporation, The Canadian Broadcasting Corporation, SBS-TV Australia ; produced by Kartemquin Educational Films, Inc