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What roles did J. Robert Oppenheimer and Leslie R. Groves play in the Manhattan Project?

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U.S. hydrogen bomb test in the Marshall Islands — nuclear weapon A test of a U.S. thermonuclear weapon (hydrogen bomb) at Enewetak atoll in the Marshall Islands, November 1, 1952.

Brigadier General Leslie R. Groves and J. Robert Oppenheimer held distinct, complementary leadership roles in the Manhattan Project, the U.S. mission to develop the atomic bomb during World War II.

Leslie R. Groves
Appointed head of the project in September 1942, Groves oversaw the entire military and industrial operation. His responsibilities included:
* Managing the construction of massive production plants for uranium and plutonium.
* Selecting key project sites and personnel.
* Implementing rigorous security and counterintelligence operations.
* Coordinating the logistics for the eventual delivery of the weapons, including the modification of B-29 aircraft and the establishment of the 509th Composite Group.12

J. Robert Oppenheimer
Oppenheimer served as the scientific director of the project's laboratory at Los Alamos, New Mexico. He was responsible for:
* Leading the research, design, and fabrication of the atomic bomb.
* Recommending the Los Alamos site, which Groves subsequently approved.
* Directing the team of scientists and engineers tasked with the complex challenge of weapon development.342