There is no substantial evidence to suggest that J. Robert Oppenheimer, the American theoretical physicist and one of the key figures in the development of the atomic bomb during World War II, was diagnosed with bipolar disorder.
Throughout his life, Oppenheimer faced various personal and professional challenges, including political scrutiny during the McCarthy era due to alleged associations with left-wing ideologies and Communist sympathizers. He also experienced periods of intense stress and pressure during the Manhattan Project.
While there are accounts of Oppenheimer displaying mood fluctuations and intense emotional experiences, these alone are not sufficient to diagnose someone with bipolar disorder. It is important to avoid speculating on the mental health of historical figures, especially without direct medical evidence or professional evaluations.
If you're interested in learning more about the life and achievements of J. Robert Oppenheimer or other historical figures, I recommend consulting reliable biographies and historical accounts written by qualified historians and researchers.