I. M. Pei (born 1917 - 2019) was a Chinese American architect, often called a master of modern architecture. Born in Guangzhou, in 1935 he moved to the United States. While enrolled at Massachusetts Institute of Technology, he became unhappy with the school's focus on Beaux-Arts architecture, and spent his free time researching the emerging architects, especially Le Corbusier. After graduating, he joined the Harvard Graduate School of Design and formed a friendship with the Bauhaus architects Walter Gropius and Marcel Breuer. Pei spent ten years working with New York real estate magnate William Zeckendorf before establishing his own independent design firm that eventually became Pei Cobb Freed & Partners. Among the early projects on which Pei took the lead were the L'Enfant Plaza Hotel in Washington, DC, and the Green Building at MIT. His first major recognition came with the National Center for Atmospheric Research in Colorado; his new stature led to his selection as chief architect for the John F. Kennedy Library in Massachusetts. He went on to design Dallas City Hall and the East Building of the National Gallery of Art. In the early 1980s, Pei was the focus of controversy when he designed a glass-and-steel pyramid for the Louvre museum in Paris. Pei has won a wide variety of prizes and awards in the field of architecture, including the 1983 Pritzker Prize, sometimes called the Nobel Prize of architecture.