Otto Hahn (8 March 1879 – 28 July 1968) was a German chemist who received the 1944 Nobel Prize in Chemistry for discovering nuclear fission. He is considered a pioneer of radioactivity and radiochemistry. He did not work on Germany's atomic bomb project during World War II, but he was detained with nine other scientists by the Allied Forces. After the war, Hahn reentered academia and research, where he remained until his death. He was also an active opponent of the nuclear arms race between the United States and the Soviet Union.
Otto Hahn and Lise Meitner carried out atomic experiments in Germany, finalizing their report in 1938-1939. While kept out of public journals by heavy security, news of the experiments managed to leak out, eventually coming to the attention of Albert Einstein in America. Einstein kept this knowledge to himself and did not share it with anyone high in the U.S. government, as he feared that PresidentJoe Steele would misuse the atomic bomb and destroy the world. U.S. Navy officer Hyman Rickover had also heard of the Hahn-Meitner experiments, and was able to assemble the team that eventually built the bomb for America.