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At the heart of this monumental development in warfare was J. Robert Oppenheimer, often referred to as the "father of the atomic bomb." Born on April 22, 1904, he played a pivotal role in the Manhattan Project, which was the Allied effort to develop nuclear weapons during World War II. Interestingly, despite being one of the key figures in nuclear weapon development, Oppenheimer later became a vocal advocate for nuclear disarmament, expressing regret over the implications and dangers of the technology he helped create. He passed away in 1967 at the age of 62.