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Tiffany Style and Louis Sullivan in the United States

In the United States, the firm of Louis Comfort Tiffany played a central role in American Art Nouveau. Born in 1848, he studied at the National Academy of Design in New York City, began working with glass at the age of 24, entered the family business started by his father, and in 1885 set up his own enterprise devoted to fine glass, and developed new techniques for its colouring. In 1893, he began making glass vases and bowls, again developing new techniques that allowed more original shapes and colouring, and began experimenting with decorative window glass. Layers of glass were printed, marbled and superimposed, giving an exceptional richness and variety of colour in 1895 his new works were featured in the Art Nouveau gallery of Siegfried Bing, giving him a new European clientele. After the death of his father in 1902, he took over the entire Tiffany enterprise, but still devoted much of his time to designing and manufacturing glass art objects. At the urging of Thomas Edison, he began to manufacture electric lamps with multicoloured glass shades in structures of bronze and iron, or decorated with mosaics, produced in numerous series and editions, each made with the care of a piece of jewellery. A team of designers and craftsmen worked on each product. The Tiffany lamp in particular became one of the icons of the Art Nouveau, but Tiffany's craftsmen designed and made extraordinary windows, vases, and other glass art. Tiffany's glass also had great success at the 1900 Exposition Universelle in Paris; his stained glass window called the Flight of Souls won a gold medal. The Columbian Exposition was an important venue for Tiffany; a chapel he designed was shown at the Pavilion of Art and Industry. The Tiffany Chapel, along with one of the windows of Tiffany's home in New York, are now on display at the Charles Hosmer Morse Museum of American Art in Winter Park, Florida.

Another important figure in American Art Nouveau was the architect Louis Sullivan. Sullivan was a leading pioneer of American modern architecture. He was the founder of the Chicago School, the architect of some of the first skyscrapers, and the teacher of Frank Lloyd Wright. His most famous saying was "Form follows function." While the form of his buildings was shaped by their function, his decoration was an example of American Art Nouveau. At the 1893 World's Columbian Exposition in Chicago, most famous for the neoclassical architecture of its renowned White City, he designed a spectacular Art Nouveau entrance for the very functional Transportation Building.

While the architecture of his Carson, Pirie, Scott and Company Building (1899) (now the Sullivan Center) was strikingly modern and functional, he surrounded the windows with stylised floral decoration. He invented equally original decoration for the National Farmer's Bank of Owatonna, Minnestota (1907–1908) and the Merchants' National Bank in Grinell, Iowa. He invented a specifically American variety of Art Nouveau, declaring that decorative forms should oscillate, surge, mix and derive without end. He created works of great precision which sometimes combined Gothic with Art Nouveau themes.

Also worth noting are the Uhl brothers from Toledo, Ohio, who set new standards in metal furniture production with their designs for the Toledo Metal Furniture Co.