1. Fellow, Department of Oral and Maxillofacial Surgery, Ewha Womans University Medical Center
2. Research Scientist, Bio R&D Center, Osstem implant Co., Ltd.
3. Senior Researcher, Bio R&D Center, Osstem implant Co., Ltd.
4. Director, Bio R&D Center, Osstem implant Co., Ltd.
5. Professor, Department of Oral and Maxillofacial Surgery, Ewha Womans University Medical Center