In Christopher Nolan’s Oppenheimer, which physicist does Cillian Murphy portray?

Cillian Murphy portrays J. Robert Oppenheimer in Christopher Nolan’s Oppenheimer.

The 2023 film follows the American theoretical physicist’s education, scientific career, leadership of the Manhattan Project, and later security-clearance controversy. Murphy plays Oppenheimer across several periods, including his work at Los Alamos during World War II and the political hearings that shaped his later reputation.

Oppenheimer was based on the 2005 biography American Prometheus by Kai Bird and Martin J. Sherwin. The film’s title refers to its central historical figure rather than to a fictional character or a general description of the atomic bomb.

Albert Einstein, Niels Bohr, and Enrico Fermi were real scientists connected to the wider historical story, but none is the character Murphy portrays.