Jacob M. Geist (1942 M.S., Chemical Engineering), a major contributor to cryogenics process safety for liquefied natural gas.[184] Karl H. Norris (1942, Agricultural Engineering), whose work contributed to the discovery of phytochrome.[185] Max S. Peters (1942 B.S., 1947 M.S., 1949 Ph.D., Chemical Engineering), National Academy of Engineering inductee and leading air pollution researcher whose studies led to the development of the catalytic converter.[186] Donald R. F. Harleman (1943, Civil Engineering), internationally recognized expert in water quality and waste treatment who led harbor cleanup efforts in numerous countries worldwide. Lee Strohl Gaumer, Jr.