Pei, I. M.(Ieoh Ming Pei)(pā), 1917–, Chinese-American architect, b. Guangzhou, China. Pei emigrated to the United States in 1935 and studied at the Univ. of Pennsylvania, the Massachusetts Institute of Technology, and Harvard, where he taught from 1945 to 1948. That year he joined Webb and Knapp, Inc.; there he designed such projects as Mile High Center in Denver (1954–59). He established his own firm in 1955. In his works, structure and environment are carefully integrated with precise geometrical design and a superb sense of craft, resulting in crisp, clear, sculptural structures. He is known for his sensuous use of such materials as marble, concrete, and glass and for his soaring interior spaces. Pei's involvement in urban planning includes the Government Center, Boston (1961), and Society Hill, Philadelphia (with Edmund N. Bacon, 1964).