Excerpts from Books and Wikipedia
"'Shall we put an end to the human race or shall mankind renounce war?' (Albert Einstein) . . . Szilard had drafted a letter to President Franklin D. Roosevelt, which he discussed with Einstein and another Hungarian physicist, Edward Teller. They decided it should go to the president under Einstein's name. Sent on August 2, 1939, the letter explained that research could lead to the construction of appallingly destructive bombs." [Furtado: 1001 Days]