He studied civil engineering, and earned a diploma from Vienna's Academy of Fine Arts. He studied architecture and urban planning at the Illinois Institute of Technology in Chicago, where he trained with Ludwig Mies van der Rohe. He also studied with Frank Lloyd Wright and Richard Neutra. He earned a master's degree in architecture from the University of California, Berkeley, in 1960. He established his own practice in Vienna four years later.
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He is best known for the large buildings he designed, but he also created tiny boutiques, home furnishings, and accessories.
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He won the Pritzker Prize in 1985.
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His architectural designs blend Modernist and traditional aesthetics. He often combined contemporary materials like plastics and aluminum with traditional ones like marble.
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While studying in the United States, he was fascinated by the fact that several cities and towns in the US are named "Vienna". He visited as many as he could.