Louis Henri Sullivan (September 3, 1856 – April 14, 1924) was an American architect, and has been called the "father of modernism." He is considered by many as the creator of the modern skyscraper, was an influential architect and critic of the Chicago School, was 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.

Sullivan and the steel high-rise
Prior to the late 19th century, the weight of a multistory building had to be supported principally by the strength of its walls. The taller the building, the more strain this placed on the lower sections of the building; since there were clear engineering limits to the weight such "load-bearing" walls could sustain, large designs meant massively thick walls on the ground floors, and definite limits on the building's height.The development of cheap, versatile steel in the second half of the 19th century changed those rules. America was in the midst of rapid social and economic growth that made for great opportunities in architectural design. A much more urbanized society was forming and the society called out for new, larger buildings. The mass production of steel was the main driving force behind the ability to build skyscrapers during the mid 1880s. As seen with the data below the prices dropped significantly during this period.

The people in Midwestern America felt less social pressure to conform to the ways and styles of the architectural past. By assembling a framework of steel girders, architects and builders could suddenly create tall, slender buildings with a strong and relatively delicate steel skeleton. The rest of the building's elements — the walls, floors, ceilings, and windows — were suspended from the steel, which carried the weight. This new way of constructing buildings, so-called "column-frame" construction, pushed them up rather than out. The steel weight-bearing frame allowed not just taller buildings, but permitted much larger windows, which meant more daylight reaching interior spaces. Interior walls became thinner, which created more usable floor space.

Chicago's Monadnock Building (which was not designed by Sullivan) straddles this remarkable moment of transition: the northern half of the building, finished in 1891, is of load-bearing construction, while the southern half, finished only two years later, is column-frame. (While experiments in this new technology were taking place in many cities, Chicago was the crucial laboratory. Industrial capital and civic pride drove a surge of new construction throughout the city's downtown in the wake of the 1871 fire.)The technical limits of weight-bearing masonry had always imposed formal as well as structural constraints; those constraints were suddenly gone. None of the historical precedents were any help, and this new freedom created a kind of technical and stylistic crisis.

Sullivan was the first to cope with that crisis. He addressed it by embracing the changes that came with the steel frame, creating a grammar of form for the high rise (base, shaft, and pediment), simplifying the appearance of the building by breaking away from historical styles, using his own intricate flora designs, in vertical bands, to draw the eye upwards and emphasize the building's vertical form, and relating the shape of the building to its specific purpose. All this was revolutionary, appealingly honest, and commercially successful.

Louis Sullivan coined the phrase "form ever follows function," which, shortened to "form follows function," would become the great battle-cry of modernist architects. This credo, which placed the demands of practical use above aesthetics, would later be taken by influential designers to imply that decorative elements, which architects call "ornament," were superfluous in modern buildings. But Sullivan himself neither thought nor designed along such dogmatic lines during the peak of his career. Indeed, while his buildings could be spare and crisp in their principal masses, he often punctuated their plain surfaces with eruptions of lush Art Nouveau and something like Celtic Revival decorations, usually cast in iron or terra cotta, and ranging from organic forms like vines and ivy, to more geometric designs, and interlace, inspired by his Irish design heritage. Terra cotta is lighter and easier to work with than stone masonry. Sullivan used it in his architecture because it had a malleability that was appropriate for his ornament. Probably the most famous example is the writhing green ironwork that covers the entrance canopies of the Carson Pirie Scott store on South State Street. These ornaments, often executed by the talented younger draftsman in

Sullivan's employ, would eventually become Sullivan's trademark; to students of architecture, they are his instantly-recognizable signature.Another signature element of Sullivan's work is the massive, semi-circul

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