written and directed by Andreas Ewels, Norbert Porta ; production ZDF, Alexandre Kegler, Sigrid Beck ; produced by Norbert Porta Sciencedocu on behalf of ZDF
produced by Michael Kirk, Mike Wiser, Vanessa Fica ; reported by Vanessa Fica ; written by Michael Kirk & Mike Wiser ; directed by Michael Kirk ; a Frontline production with Kirk Documentary Group
directed by Michael Kirk ; narrated by Will Lyman ; produced by Vanessa Fica, Mike Wiser, Michael Kirk, WGBH Educational Foundation, Kirk Documentary Group