Leo Szilard

Leo Szilard (born Spitz Leó) was a Hungarian-German-American physicist and inventor. He conceived the nuclear chain reaction in 1933, patented the idea of a nuclear reactor with Enrico Fermi in 1934, and in late 1939 wrote the letter for Albert Einstein's signature that resulted in the Manhattan Project that built the atomic bomb. He left Hungary in 1919, lived in Germany until 1938 and then moved to the US, where he lived until his death. Hungarian name: Szilárd Leó