1995.9 - current: Professor, Electrical and Electronics Engineering, Yonsei University
2002.3 - 2003.2: Visiting Professor, University of Waterloo, Waterloo, Ontario, Canada.
1994.5 - 1996.8: Senior Engineer, Qualcomm Inc., San Diego, California
1992.1 - 1994.4: Post-Doc Research Associate, Communication Science Institute at USC
1986.9 - 1991.12: PHD at USC, Dept of EE-Systems (Advisor: Dr. S. W. Golomb)
1984.9 - 1986.5: MSEE at USC, Dept of EE-Systems
1980.3 - 1984.2: BS Eng. at Yonsei University, Dept of Electronics