A group of highly influential architects, including Adler and Sullivan, Burnham and Root, William LeBaron Jenney, and their followers in Chicago in the latter part of the 19th century. The Schools central philosophy was that architectural design should be of its time rather than based on the past. This group initially applied its philosophy to both skyscrapers and homes, but its greatest and most lasting influence was in the design of skyscrapers, and its greatest achievements were in structural design. Also see Prairie School.