Tsung Dao Lee studied at the University of Chicago with Enrico Fermi before going on to several professorships. In 1950, he earned his PhD under Enrico Fermi. With Chen Ning Yang, he received the Nobel Prize for Physics in 1957 for work in finding violations of the principle of parity conservation (the quality of space reflection symmetry of subatomic particle interactions), thus bringing about major refinements in particle physics theory. Lee became a U.S. citizen in 1962. He continued his work in quantum physics and other areas such as astrophysics and lattice QCD at Columbia University until his retirement.
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