Oppenheimer is a 2023 epic biographical thriller film written, co-produced, and directed by Christopher Nolan. It follows the life of J. Robert Oppenheimer, the American theoretical physicist who led the development of the first nuclear weapons during World War II. Based on the 2005 biography American Prometheus by Kai Bird and Martin J. Sherwin, the film dramatizes Oppenheimer's studies, his direction of the Los Alamos Laboratory and his 1954 security hearing. Cillian Murphy stars as Oppenheimer, alongside an ensemble supporting cast that includes Emily Blunt, Matt Damon, Robert Downey Jr., Florence Pugh, Josh Hartnett, Casey Affleck, Rami Malek, and Kenneth Branagh. Oppenheimer was announced in September 2021. It was Nolan's first film not distributed by Warner Bros. Pictures since Memento (2000), due to his conflicts regarding the studio's simultaneous theatrical and HBO Max release schedule. Murphy was the first cast member to join, with the rest joining between November 2021 and April 2022. Pre-production began by January 2022, and filming took place from February to May.
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