- With U. College Hospital Medical School, London, England., 1937-1938. Assistant professor organic chemistry California Institute Technology, Pasadena, 1938-1943, associate professor, 1943-1945, professor since 1945.
Served as official investigator National Defense Research Committee, 1942-1945, division. Member and section chairman, 1943-1946. Member National Academy Sciences (chairman chemistry section 1962-1964), American Chemical Society American Society Biological Chemists, American Association for the Advancement of Science, Chemical Society (London), Sigma Xi, Gamma Alpha, Phi Lambda Upsilon, Alpha Chi Sigma.