Louis Henri Sullivan
Sullivan, Louis Henri (1856–1924), U.S. architect whose office buildings pioneered modern design. In partnership with Dankmar Adler in Chicago (1881–95), he championed the view that a building's form should express its function. His works include the Auditorium (1889) and the Carson Pirie Scott building (1899–1904) in Chicago, and the Guaranty Building in Buffalo (1894–95). Frank Lloyd Wright was his pupil.
See also: Architecture.