Science · Physics

J. Robert Oppenheimer

1904–1967 · American

Theoretical physics; nuclear weapons

J. Robert Oppenheimer was the American theoretical physicist who directed the Los Alamos Laboratory during the Manhattan Project, earning the label "father of the atomic bomb". After the Trinity test of July 1945 and the bombing of Hiroshima and Nagasaki, he opposed development of the hydrogen bomb. In 1954 his security clearance was revoked after a notorious hearing, a decision the US Department of Energy formally vacated in 2022.

How to spot them

▸Director of Los Alamos; 'father of the atomic bomb'
▸Quoted the Bhagavad Gita: 'Now I am become Death, the destroyer of worlds'
▸Named the first nuclear test 'Trinity' (16 July 1945)
▸1954 security hearing; biography American Prometheus; Christopher Nolan's 2023 film Oppenheimer

Key discoveries & works

Scientific direction of the Los Alamos Laboratory (1943–1945)

Led the wartime laboratory that designed and built the first atomic bombs

The Trinity test (1945)

First detonation of a nuclear weapon, in the New Mexico desert; he chose the code name

Born–Oppenheimer approximation (1927)

Separates the motion of nuclei and electrons in molecules; from his doctoral period at Göttingen

Gravitational collapse of a massive star (with Hartland Snyder) (1939)

Early theoretical description of what are now called black holes

Directorship of the Institute for Advanced Study, Princeton (1947–1966)

Headed the institute where Einstein and Gödel worked

Key ideas

Advocated international control of atomic energy after the war
As chair of the Atomic Energy Commission's General Advisory Committee, opposed a crash programme to build the hydrogen bomb (1949)

Quick-fire facts

•Born in New York City in 1904; died in Princeton, New Jersey, in 1967
•Studied at Harvard, then Cambridge, and took his PhD at Göttingen under Max Born in 1927
•The code name 'Trinity' is said to have been inspired by a John Donne sonnet
•Learned Sanskrit and read the Bhagavad Gita in the original
•His security clearance was revoked in 1954 after an Atomic Energy Commission hearing; in December 2022 the Department of Energy vacated that decision
•Received the Enrico Fermi Award in 1963
•Subject of the Pulitzer-winning biography American Prometheus (2005) by Kai Bird and Martin J. Sherwin, the basis of Nolan's Oscar-winning film Oppenheimer (2023), with Cillian Murphy in the title role
•The central figure of John Adams's opera Doctor Atomic (2005)

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Sources

Atomic Heritage Foundation / National Museum of Nuclear Science & History — J. Robert Oppenheimer
Kai Bird and Martin J. Sherwin — American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer