- Esthetic Orthodontics, Lingual Orthodontics
- Adjunct Professor of Yonsei Hosp., Dental college, Yonsei univ.
- Adjunct Professor of Myunggi Hosp., Medical college, Gwandong univ.
- Dental College, Yonsei Univ. (DDS)
- Graduate School, Yonsei Univ. (MSD)
- Intern & Resident at the Dept. of Orthodontics, Dental Hosp., Yonsei Medical Center
- Visiting Doctor at the Dental college, Pennsylvania univ.
- Adjunct Professor of Yonsei Hosp., Dental college, Yonsei univ.
- Director of Training Affairs at the Korean Academy of Orthodontics