Passionate Productions for BBC ; produced for NOVA by Holt Productions, LLC ; WGBH Boston ; produced and directed by Jemima Harrison and Sarah Holt ; writer for the BBC, Jemima Harrison ; executive producer for the BBC, Richard Klein ; senior executive producer, Paula S. Apsell
a Nova production by Ark Media in association with Realization Pictures ; written and directed by Phil Bertelsen ; produced by Phil Bertelsen and Jane Teeling
Eagle Rock Film Productions Limited in association with the Independent Film Channel ; a Bill and Ben Production ; producers, Bill Jones and Ben Timlett ; directors Bill Jones, Alan G. Parker and Ben Timlett
a production of Thirteen and ArgoFilms in association with WNET.org for PBS ; written, produced and directed by Allison Argo ; executive producer, Fred Kaufman ; series producer, Bill Murphy