James Marsh is a British film and documentary director best known for his work on Man on Wire, which won the 2008 Academy Award for Best Documentary Feature, and The Theory of Everything, the multi-award-winning biopic of physicist Stephen Hawking released in 2014.

Man on Wire is a 2008 documentary film directed by James Marsh. The film chronicles Philippe Petit's 1974 high-wire walk between the Twin Towers of New York's World Trade Center. It is based on Petit's 2002 book, To Reach the Clouds, released in paperback with the title Man on Wire. The title of the film is taken from the police report that led to the arrest of Petit, whose performance lasted for almost an hour. The film is crafted like a heist film, presenting rare footage of the preparations for the event and still photographs of the walk, alongside re-enactments and present-day interviews with the participants, including Barry Greenhouse, an insurance executive who served as the inside man.