University of California, San Francisco (USCF) Clinical Professor, University of British Columbia (UBC) Adjunctive Professor Sungkyunkwan University School of Medicine Samsung Seoul Hospital Dentistry Director and Head Professor Seoul National University College of Dentistry, Samsung Seoul Hospital Outpatient Professor Samsung Seoul Hospital Outpatient Professor Seoul National University College of Dentistry Adjunct Professor, Seoul National University World Vision Director, Seoul National University Dental Hospital Outside Director, Seoul National University Dental Hospital President, Korean