David Rittenberg

David Rittenberg (November 11, 1906 – January 24, 1970) was an American biochemist who pioneered the isotopic ''tagging'' of molecules. He was born and died in New York, and spent almost the whole of his life there. He obtained his B.S. in 1929 from the City College of New York, and his Ph.D. in 1935 at Columbia University under the supervision of Harold Urey. Provided by Wikipedia