He was with AT&T Bell Laboratories in New Jersey and joined to Seoul National University, Korea, where he is a Professor and served as Department Head for EECS and Director of Institute of New Media and Communications. He received BS and MS degrees from Seoul National University and PhD from the University of Michigan at Ann Arbor in 1986. He was a Visiting Professor at the University of Tokyo and NTT Laboratories, Japan, and Tsinghua University, China.
His research activities are in physical layer wireless communications such as MIMO, OFDM, cooperative diversity, and cognitive radio, and consulting to major wireless industries. He did consulting for Koreasat. He was Principal Investigator in communications for ITS Grand Design Project of the Korean government and has been a Council Member of ITS Korea since its establishment in 1999. His laboratory was designated as a National Research Laboratory by Korean Ministry of Science and Technology. He published over 360 papers with 3,700 citations and holds thirty-four patents.
He was President of Institute of Electronics Engineers of Korea (renamed Institue of Electronics and Information Engineers) and Korean Society of Broadcast Engineers. He is an IEEE Fellow and Member of the Korean Academy of Science and Technology and the National Academy of Engineering of Korea.
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