Oppenheimer Cast

While Cillian Murphy leads the cast as the titular J. Robert Oppenheimer, the cast also contains Hollywood legends such as Emily Blunt, Robert Downey Jr., and even a surprise appearance from Gary Oldman.

After being featured in five previous Christopher Nolan films, Peaky Blinders star Cillian Murphy gets to take on the leading role in Oppenheimer. 

J. Robert Oppenheimer was a renowned American physicist and the scientific director of the Manhattan Project, leading the development of the atomic bomb during World War II.

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He'll be portrayed by Robert Downey Jr., an actor trying to find his new direction after an 11-year stint playing Iron Man/Tony Stark.

Florence Pugh takes on the pivotal role of Jean Tatlock, an American psychiatrist, and poet known for her romantic involvement with J. Robert Oppenheimer.

Ernest Lawrence was an American physicist and inventor who played a crucial role in the Manhattan Project. Josh Hartnett, who recently starred with Aaron Paul in Season 6 of Black Mirror, takes on the role.

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Boris Pash, an American military officer and intelligence agent, gained recognition as the leader of a mission that had the objective of collecting intelligence regarding the development of German nuclear weapons.

Academy Award-winning actor Rami Malek, best known for his roles in Bohemian Rhapsody and No Time to Die, plays David Hill, an experimental physicist at the University of Chicago’s Met Lab during the Manhattan Project.

Kenneth Branagh (Murder on the Orient Express) plays Niels Bohr, a Danish physicist who made significant contributions to the understanding of atomic structure and quantum mechanics.

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Actor and director (Uncut Gems) Benny Safdie plays Edward Teller, a Hungarian-American theoretical physicist who is often called the father of the hydrogen bomb.

Dylan Arnold (You) is Frank Oppenheimer, the younger brother of Cillian Murphy's character. Frank made significant contributions to the field of particle physics and played a key role in promoting scientific literacy.

Hans Bethe was a German-American physicist who played a crucial role in the Manhattan Project, making important contributions to the development of the atomic bomb.

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Isidor Isaac Rabi was a Noble Prize-winning American physicist. He played a significant role in the Manhattan Project, working on the development of radar technology.

Vannevar Bush served as the director of the Office of Scientific Research and Development during World War II, where he oversaw numerous scientific and technological advancements, including the Manhattan Project.

The most famous scientist of the 20th Century, Albert Einstein revolutionized humanity's understanding of the universe with his theory of relativity. Toni Conti plays the legendary physicist in Oppenheimer.

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Michael Angarano, best known as Will Stronghold in 2005's Sky High, plays Robert Serber, a physicist who worked closely with J. Robert Oppenheimer and contributed to the development of the atomic bomb.

From The Boys and My Adventures with Superman, Jack Quaid is Richard Feynman, who worked as a member of the theoretical division at Los Alamos Laboratory. This is where Oppenheimer served as the scientific director of the Manhattan Project.

Kenneth Bainbridge served as the director of the Trinity Test, which was the first successful detonation of a nuclear weapon in history. He's played by Josh Peck, most famously known as Josh Nichols on Nickelodeon's Drake & Josh.

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Kenneth Nichols served as the district engineer in charge of the Manhattan Project's construction and infrastructure. He's played by Dane DeHaan, known for his work in 2012's Chronicle and 2014's The Amazing Spider-Man 2.

Enrico Fermi played a pivotal role in the development of the first controlled, self-sustaining nuclear chain reaction, leading to the creation of the atomic bomb. Danny Deffarrari is best known for his role in Shiva Baby.

Best known from Zero Dark Thirty, Jason Clarke plays Roger Robb, a circuit judge who served as special counsel to an Atomic Energy Commission hearing.

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James D'Arcy has worked with Nolan before in 2017's Dunkirk, this time he plays Patrick Blackett, a professor, and tutor of J. Robert Oppenheimer and Cambridge.

Seth Neddermeyer was a physicist who played a key role in the research and development of implosion-type nuclear weapons. He's played by Devon Bostick, best known for his role as Rodrick in the Diary of a Wimpy Kid films.

Luis Walter Alvarez was a physicist who worked on the development of radar and conducting research related to nuclear weapons. Alex Wolff, best known for The Naked Brothers Band and Jumanji, takes on the role.

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Josh Zuckerman (Sex Drive) plays Giovanni Rossi Lomanitz, a physicist and chemist involved in research on nuclear fusion, plasma physics, and the effects of radiation.

From Army of Thieves, Matthias Schweighöfer takes on the role of Werner Heisenberg, a German physicist who made groundbreaking contributions to the field of quantum mechanics.

Donald Hornig was a scientist that was part of the team at Los Alamos Laboratory, where he was involved in the testing and evaluation of nuclear weapons. David Rysdahl from Hulu's No Exit portrays the expert.

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Philip Morrison was a physicist who played a role in the Manhattan Project. His work in nuclear physics during this project laid the foundation for his later endeavors in science education and communication.

George Kistiakowsky was a Ukrainian-American chemist and explosives expert who served as the head of the Explosives Division, overseeing the design and development of explosive lenses used in nuclear weapons.

Edward Condon was a physicist known for his contributions to quantum mechanics and atomic physics. He worked on the development of radar systems during the Manhattan Project.

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Harry S. Truman was the 33rd President of the United States. He was ultimately responsible for making the decision to use atomic bombs on Hiroshima and Nagasaki, which were developed under Oppenheimer's direction.

Gary Oldman, best known for Christopher Nolan's The Dark Knight trilogy and playing Winston Churchill in Darkest Hour, takes on the powerful role.

Best known from 1979's Stark Trek, John Gowans plays Ward Evans, a chemist and professor who was one of the three members of the commission that revoked J. Robert Oppenheimer's security clearance.

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Thomas A. Morgan was on the Personnel Security Board that conducted the security clearance hearings against Oppenheimer. He's played by Kurt Koehler, who has briefly appeared on TV shows such as Agents of SHIELD, The Big Bang Theory, and Parks and Recreation.

Senator Gale W. McGee was involved in national policy discussions and legislation that may have intersected with Oppenheimer's work or the broader field of nuclear energy.

A Christopher Nolan veteran, Jack Cutmore-Scott (Tenet and Dunkirk) plays Lyall Johnson, a participant in the World War II atomic bomb project who later assumed supervisory positions within the U.S. Atomic Energy Commission.

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Henry Stimson was the United States Secretary of War known for his role in the decision to use atomic bombs on Hiroshima and Nagasaki and advocating for the establishment of the United Nations.

Best known from the TV series White Collar, Tim DeKay plays John Pastore, an American politician who served as a United States Senator from Rhode Island from 1950 to 1976.

Ted King (The Bold and the Beautiful) is playing Edward Lewis Bob Bartlett, an influential Alaska politician who served as a U.S. Senator.

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Senator Scott is likely Hugh Scott, a previous representative for Pennsylvania in the U.S. House of Representatives and eventually the U.S. Senate. Steven Houska recently appeared in an episode of General Hospital.

Kurt Gödel, an influential mathematician, is known for his theorems that revolutionized mathematics and had far-reaching implications for philosophy and computer science.

Sadie Stratton, as seen in Underground and West World, plays Mary Washburn, a member of the Communist Party who introduces Jean Tatlock to Oppenheimer.

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Rory Keane (The Big Door Prize) plays Hartland Snyder, a physicist, who collaborated with Oppenheimer to calculate the gravitational collapse of a dust particle sphere.

Hap Lawrence plays Lyndon B. Johnson, the 36th president of the United States who presented Oppenheimer with the AEC's Enrico Fermi Award. 

Michael Andrew Baker plays Joe Volpe, the legal adviser to Gen. Leslie R. Groves who helped secure uranium and other materials used in the construction of the atomic bomb. 

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Wilkins worked with Eugene Wigner in researching neutron absorption which led to their discovery of how to estimate the distribution of neutron energies within nuclear reactors.

Will Roberts plays George C. Marshall, a United States general who served as a key figure in the country's atomic weapons program. 

Pat Skipper plays James Byrnes, President Harry Truman's foreign policy advisor who played a key role in the discussions on how to use the atomic bomb. 

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Steve Coulter plays James Conant, one of the dignitaries present during the Trinity nuclear test. He was also part of the Interim Committee that advised President Truman to use atomic bombs on Japan.