Julius Robert Oppenheimer (Apr 1904 – Feb Theoretical Physicist and Professor of Physics at University of California, Berkeley. With Enrico Fermi, he is called "Father of the Atomic Bomb": "Now, I am become Death, the destroyer of worlds.
One of the bombs created during the Manhattan Project. The Manhattan Project was launched by America during World War II, and led to the creation of the first atomic bombs. Looking back in history, I'm surprised we haven't killed ourselves yet.