David Ambrose is a documentary filmmaker who generates impact by exposing clandestine crusades and delving into forgotten histories, linking them to contemporary societal issues to focus awareness and create positive change. As director, he has helmed several feature documentaries in collaboration with investigative journalist Greg Palast, including The Best Democracy Money Can Buy (2016), about insidious endeavors to purge the voter rolls in predominantly Black communities; Vigilantes, Inc.: The New Vote Suppression Hitmen (2024), narrated by Rosario Dawson and produced by Maria Florio, Martin Sheen and George DiCaprio, exposing voter suppression campaigns around the country funded by anti-democracy forces; and the upcoming Long Knife: The Osage Nation, Koch Oil and the New Killers of the Flower Moon (2025), produced by George DiCaprio, which follows the story begun in Scorsese’s film Killers of the Flower Moon to the present day.