• Chairman – Orthodontic Department of Yonsei University – South Korea
• International member of American Association of Orthodontists
• Member of World Federation of Orthodontists
• Advisory member of World Implant Orthodontics Association
• Auditor, Korean Cleft Lip and Palate Association (2015-)
• Editor-in-Chief, Journal of Korean Dental Science (2014-)
• Founding member/Director of Scientific Affairs, Korean Association of Lingual Orthodontists
• Reviewer of American Journal of Orthodontics and Dentofacial Orthopedics, Angle Orthodontists, Korean Journal of Orthodontists, European Journal of Orthodontics, Journal of Orthodontic Science