Korean Dentist Periodontist, Chonnam National University College of Dentistry Adjunct Professor, Korean Society of Periodontology Accredited Physician and Educational Guidance Visiting Professor, Department of Implantology, University of California Dentistry, U.S. Implant Department, WPDI Dental Hospital, U.S. Seoyoung University Adjunct Professor, Department of Dental Hygiene Adjunct Professor, Graduate School of Dentistry, Chonnam National University