The Curtis Organ, named for publisher Cyrus H.K. Curtis, is one of the largest pipe organs in the world with 162 ranks and 10,731 pipes. It was manufactured by the Austin Organ Company as its Opus 1416 in 1926 for the Philadelphia Sesquicentennial Exposition. It was known as the "Organists' Organ" because the specifications were formulated by Henry S. Fry, John M'E. Ward, Rollo F. Maitland, Frederick Maxson, and S. Wesley Sears, all prominent Philadelphia organists.