Ludwig Mies van der Rohe was a pioneering German-American architect who worked in Germany until 1937 before immigrating to the United States. Some of his most notable works include the Barcelona Pavilion built for the 1929 World's Fair, which featured an innovative steel and glass structure, and the Villa Tugendhat in Brno, Czech Republic, built from 1928-1930 using a revolutionary iron framework. Later in his career, Mies designed several influential glass and steel skyscrapers in Chicago and New York that came to define the International Style of modern architecture.