United states physicist who directed the project at los alamos that developed the first atomic bomb?

The United States physicist who directed the project at Los Alamos that developed the first atomic bomb was J. Robert Oppenheimer. He played a crucial role as the scientific director of the Manhattan Project during World War II, overseeing the research and development of nuclear weapons. Oppenheimer's leadership and vision were instrumental in successfully creating the bomb, which was first tested in July 1945 at the Trinity site in New Mexico.