The Auditorium Building in Chicago is one of the best-known designs of Louis Sullivan and Dankmar Adler. Completed in 1889, the building is located at the northwest corner of South Michigan Avenue and Ida B. Wells Drive. The building was designed to be a multi-use complex, including offices, a theater, and a hotel. As a young apprentice, Frank Lloyd Wright worked on some of the interior design.

Louis Henry Sullivan was an American architect, and has been called a "father of skyscrapers" and "father of modernism." He was an influential architect of the Chicago School, a mentor to Frank Lloyd Wright, and an inspiration to the Chicago group of architects who have come to be known as the Prairie School. Along with Wright and Henry Hobson Richardson, Sullivan is one of "the recognized trinity of American architecture." The phrase "form follows function" is attributed to him, although the idea was theorised by Viollet le Duc who considered that structure and function in architecture should be the sole determinants of form. In 1944, Sullivan was the second architect to posthumously receive the AIA Gold Medal.