written, produced, & directed by Iain Riddick ; produced by Ruth Roberts ; produced by Darlow Smithson Productions Ltd, Shock of Mighty Productions and Handel Productions (EFS) Inc. in association with NOVA/WGBH Educational Foundation and Discovery Channel Canada ; WGBH
series producer, David Allen ; story producers, Gaby Bastyra, Joe Loncraine, Laura Flegg, Anna McVey ; a National Georgraphic Television and Passion Planet Production for PBS