- Implant, Esthetic Dentistry, Periodontology
- Adjunct Professor of Dental college, Yonsei univ.
- Adjunct Professor of Graduate school of Clinical Dentistry, Ewha womans univ.
- Chief Professional Programmer of NosDIAtech
- Daewon Foreign Language High School
- Dental College, Yonsei Univ. (DDS)
- Graduate School, Yonsei Univ. (MSD,PhD)
- Intern & Resident at the Dept. of Periodontology, Dental Hosp., Yonsei Medical Center
- Director of General Affairs at Yon-A Humanity Forum
- Director of Information Correspond Affairs at the Korean Academy of Periodontology(KAP)
- Director of Legal Affairs at Uijungbu Dental Association
- Director of International Planning Affairs at the Korean Academy of Oral & Maxillofacial Implantology(KAOMI)