Naman Ramachandran Sioban Sinnerton, executive producer of Oscar-nominated and BAFTA, Emmy and Cannes-winning documentary “For Sama,” has joined Hillary Clinton, Sam Branson and Chelsea Clinton’s production outfit HiddenLight Productions.Sinnerton will take on the newly created role of creative director and senior VP unscripted, and will report into CEO Johnny Webb. She joins from U.K.