Instructor State University Iowa, 1909-1910. Physicist, Nela Research laboratories, 1910-1920. Director applied science Nela Research laboratories, National Lamp Works of General Electric Company, 1920-1924.
Director Lighting Research Laboratory, Lamp Department of General Electric Company, 1924-1950. Consultant on light, lighting, color since 1950, Chairman commission on camouflage, National Research Council, World War I.
Born September 14, 1889