“Oppenheimer” is set to hit theaters in July 2023. Bit by bit, the project has come together to include an impressive ensemble of actors and actresses in varying roles and capacities and a unique approach to one of history’s most important stories.Led by Cillian Murphy, who will portray the father of the atomic bomb, other stars like Florence Pugh, Robert Downey Jr., Matt Damon, Rami Malek, Emily Hunt and more will bring his life story to the big screen, marking Nolan’s first new film since 2020’s “Tenet.”Here’s everything we know about Christopher Nolan’s “Oppenheimer”:Written and directed by Nolan, the film is based on the book “American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer” written by Kai Bird and Martin J Sherwin and published in May 2006.