PBS ; produced and directed by Riva Freifeld ; written by Ken Chowder ; co-produced by Amy Brown ; a Riva Productions film for American Experience ; WGBH Boston
PBS ; directed by Mark Zwonitzer and Michael Chin ; produced and written by Mark Zwonitzer ; a Hidden Hill Productions film for American Experience ; a production of WGBH Boston
director, Doug Hawes-Davis ; associate producer and editor, Drury Gunn Carr ; produced by High Plains Films ; a Fund for Animals picture ; an Ecology Center production
Caliber Media presents ; in association with The Fyzz Facility and Realmbuilder Productions ; a Dallas Sonnier & Jack Heller production ; produced by Dallas Sonnier & Jack Heller ; written and directed by S. Craig Zahler