Roland Joffé
This film reenacts the Manhattan Project, the secret WWII project, and the first atomic bombs designed, built, and tested in Los Alamos.
In real life, Robert Oppenheimer was the scientific head of the Manhattan Project, the secret wartime project in New Mexico where the first atomic bombs were designed and built. General Leslie Groves was in overall command of it. This film reenacts the project with an emphasis on their relationship.