?  DDS in Yonsei University, Seoul Korea 

?  PhD in Yonsei University College of Dentistry, Seoul Korea

?  Specialty Program in Department of Periodontology, Yonsei University College of Dentistry

?  Specialty Program in Department of prosthodontics, State University at Buffalo 

?  Clinical assistant professor, Yonsei University 

?  Professor, Department of Periodontology, Seoul National University