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- Managing Scientist, Health Science Centers, Exponent, Inc. 2009-Present
- Associate Professor, Korea University School of Medicine, Korea, 2006–2009
- Assistant Professor, Korea University School of Medicine, Korea, 2003–2006
- Department Director/Physician, Department of Family Medicine, Ansan Hospital, Korea University Medical Center, Korea, 1998–2009
- Research Assistant/Consultant, Johns Hopkins Medical Institution, 2007–2008
- Professor Extraordinary, Korea Digital University, Korea, 2002–2006
- Clinical Instructor/Clinical Assistant Professor, Department of Family Medicine, Korea University Medical Center, Korea, 1998–2003
- Military Doctor, Korean Army, Korea, 1995–1998
- Medical Officer, MINURSO, UN, Western Sahara, 1997–1997
- Resident Physician, Korea University Medical Center, 1992–1995
