Dankmar Adler invited Louis Sullivan to join his firm in 1879 and made him a partner in 1883. Adler and Sullivan's fifteen-year architectural partnership produced some of the most important structures in the history of American architecture. Adler and Sullivan complemented each other perfectly. Adler was recognized as an outstanding acoustical and structural engineer while Louis Henry Sullivan was famous for his design and ornament. The result was a very successful firm know for creating original structures that evolved from the functional requirements of each project, pushed the limits of the most modern technologies and included innovative, often ornamental, design.
Adler and Sullivan initially designed primarily residences and small commercial buildings, including the Ryerson and Troescher, Eliel House, Jewelers' Building, and Kaufmann Store and Flats. In 1886, less than five years after the formal partnership began, Adler and Sullivan began work on the Auditorium Building. Frank Lloyd Wright was hired as a young draftsman by the firm in 1888. By late 1880s, the firm of Adler and Sullivan was designing large structures such as the Stock Exchange, Schiller Theater, the Wainwright in St. Louis, Mo., and the Guaranty buildings in Buffalo, N.Y. The firm of Adler and Sullivan designed approximately 180 buildings, of which the crowning achievement is widely considered to be the Auditorium Building.