Warren, Whitney, 1864–1943, American architect, b. New York City, studied at the École des Beaux-Arts. He began practice in New York City in 1894. Later he joined with Charles D. Wetmore in a firm that had one of the most extensive practices of its time and was known for the designing of large hotels. Warren and Wetmore's New York works include the Grand Central Terminal (1903–13, built in collaboration with the firm Reed and Stem), the New York Central office building, the Chelsea docks, and the Ritz-Carlton, Biltmore, Commodore, and Ambassador hotels. After World War I they were entrusted with the reconstruction of the historic library of the Univ. of Louvain, Belgium, which had been destroyed by the Germans who again demolished it in 1940.