Harold Clayton Urey was an American physical chemist who conducted pioneering work on isotopes. He earned the 1934 Nobel Prize in Chemistry "for his discovery of heavy hydrogen." He played a significant role in the development of the atom bomb, as well as contributing to theories on the development of organic life from non-living matter. The Nobel Prize in Chemistry 1934, announced November 15, 1934. Harold C. Urey, “for his discovery of heavy hydrogen”. Harold C. Urey: born 1893, Walkerton, IN, USA. Wiki link Data: the Nobel Foundation (CC0).