Ieoh Ming Pei, FAIA, RIBA, commonly known as I. M. Pei, is a Chinese-American architect. In 1948, Pei was recruited by New York real estate magnate William Zeckendorf. There he spent seven years before establishing his own independent design firm I. M. Pei & Associates in 1955, which became I. M. Pei & Partners in 1966 and later in 1989 became Pei Cobb Freed & Partners. Pei retired from full-time practice in 1990.