Flagg, Ernest, 1857–1947, American architect, b. Brooklyn, N.Y., studied at the École des Beaux-Arts, Paris. The 45-story Singer Building in New York City, which he built in 1908, marked a revolutionary height. Flagg's other works include the Scribner Building, New York City, the Corcoran Gallery of Art, Washington, D.C., and numerous residences. In magazine articles and in his book, Small Houses: Their Economic Design and Construction (1922), Flagg advocated various structural economies and innovations. These include a method of house planning on a module basis and model tenement housing. He wrote also Le Naos du Parthenon (1928, in French and English), a study in Greek units of proportion.