a Nova/WGBH production ; produced by Matthew Barrett, John Rubin, and Sarah Holt ; written by John Rubin ; directed by John Rubin, Rushmore Denooyer, Serena Davies, and Sarah Holt
written, produced and directed by Peter Frumkin ; produced in association with the Center for Independent Documentary ; a co-production of Peter Frumkin Productions LLC and Thirteen/WNET New York
a Frontline co-production with RAINmedia, Inc. ; a production of WGBH/Boston ; written and produced by Martin Smith and Marcela Gaviria ; co-produced by Will Cohen
written and produced by Graham Chedd ; directed by Larry Engel ; a co-production of Chedd-Angier-Lewis Productions and Thirteen in association with WNET.ORG