Professor of Physics, National University of Peking (1934-1946)
Visiting Professor of Physics, University of Michigan (1947)
Research Associate, Columbia University (1947-1949)
Visiting Professor of Physics, New York University (1948-1949)
Principal Research Officer and Head of the Theoretical Physics Section, National Research Council of Canada (1949-1963)
Visiting Professor of the China Foundation at National Taiwan University and National Tsing Hua University (1956-1957)
Memberr, Institute of Advanced Study, Princeton, New Jersey ( 1958-1959)
Visiting Professor of Fonds National Suisse de la Recherche Scientifique, University of Lausanne, Switzerland (1960-1961)
Professor of Physics, Polytechnic Institute of Brooklyn, N. Y. (1963-1965)
Professor of Physics, State University of New York at Buffalo (1965-1978)、Chairman of Department of Physics and Astronomy (1966-1969) 、Professor Emeritus ( 1978 - )
President, Academia Sinica, R. O. C. (1983-1994)
曾獲得之學術榮譽
Academician, Academia Sinica, R. O. C. (1948)
Medal of Special Merits, Ministry of Education, Republic of China (1956)
Fellow, the Royal Society of Canada ( 1957)
Fellow, the American Physical Society (1963)
Ramon Magsaysay Award for Government Service ( 1984)
Honorary degree of Doctor of Science, University of Michigan (1991)
The First Award for Contribution to Physics, the Physical Society of the of China ( 1992)
Honorary Professor of Physics, Beijing University (1992)
Honorary Doctor's Degree, Nankai University (1992)
Honorary Degree of Doctor of Science, National Chiao-tung University (1993)
Honorary Degree of Doctor of Science, Hong Kong Institute of Science an Technology ( 1993)