Victor Pierre Horta (; Victor, Baron Horta after 1932; 6 January 1861 – 8 September 1947) was a Belgian architect and designer, and one of the founders of the Art Nouveau movement. His Hôtel Tassel in Brussels built in 1892–1893, is often considered the first Art Nouveau house, and, along with three of his other early houses, is listed as a UNESCO World Heritage Site. The curving stylized vegetal forms that Horta used influenced many others, including architect Hector Guimard, who used it in the first house he designed in Paris and in the entrances he designed for the Paris Metro. He is also considered a precursor of modern architecture for his open floor plans and his innovative use of iron, steel and glass.