Robert Zemeckis to direct Adaptation of Roald Dahl’s The Witches Variety reports director Robert Zemeckis (Back to the Future, Flight, Forrest Gump) is in final negotiations with Warner Bros. to direct The Witches, a feature film adaptation of Roald Dahl’s novel. Zemeckis will also pen the script for the adaptation and will produce with partner Jack Rapke, having previously collaborated on a number of films together.