- Adjunct Associate Professor at Loma Linda University, California, USA (2005 – 2015)
- Lecturer at annual meetings of American Association of Orthodontists(AAO), World Implant Orthodontic Conference(WIOC), Federation Francaise d’Orthodontie (FFO) and Korean Association of Orthodontists (KAO)
- The past president of the Korean Society of Digital Orthodontists
- Advisor of the Korean Society of Digital Orthodontists.
