(1)University of California, Los Angeles 1986present
*Associate Dean for Academic Personnel, Henry Samueli School of Engineering and Applied Science
*Distinguished Professor of Electrical and Computer Engineering
*Professor of Electrical Engineering
*Associate Professor of Electrical Engineering
(2)GTE Laboratories, Inc. 19831986
*Senior MTS, Fundamental Research Laboratory
(3)State University of New York at Buffalo 19821984
*Assistant Professor of Electrical and Computer Engineering
(4)National Chiao Tung University 2010present
*Chair Professor of Photonics (終身講座教授)