James Bryant Conant (March 26, 1893 – February 11, 1978) was an American chemist, a President of Harvard University, and the first U.S. Ambassador to West Germany.
During World War I, he served in the U.S. Army, where he worked on the development of poison gases, especially lewisite. He became an assistant professor of chemistry at Harvard University in 1919 and the Sheldon Emery Professor of Organic Chemistry in 1929. He researched the physical structures of natural products, particularly chlorophyll, and he was one of the first to explore the sometimes complex relationship between chemical equilibrium and the reaction rate of chemical processes. He studied the biochemistry of oxyhemoglobin providing insight into the disease methemoglobinemia, helped to explain the structure of chlorophyll, and contributed important insights that underlie modern theories of acid-base chemistry.
