Louis Sullivan, American architect and educator, designed the Carson, Pirie, Scott and Company Building (died 1924)

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; it encapsulated earlier theories of architecture and he applied them to the modern age of the skyscraper. In 1944, Sullivan was the second architect to posthumously receive the AIA Gold Medal.

The Sullivan Center, formerly known as the Carson, Pirie, Scott and Company Building or Carson, Pirie, Scott and Company Store, is a commercial building at 1 South State Street at the corner of East Madison Street in Chicago, Illinois. Louis Sullivan designed it for the retail firm Schlesinger & Mayer in 1899 and later expanded it before H.G. Selfridge & Co. purchased the structure in 1904. That firm occupied the structure for only a matter of weeks before it sold the building to Otto Young, who then leased it to Carson Pirie Scott for $7,000 per month, which occupied the building for more than a century until 2006. Subsequent additions were completed by Daniel Burnham in 1906 and Holabird & Root in 1961.