Memberships, Offices and Committee Assignments in Professional Societies:
Korean Surgical Society Secretary General,
Korean Cancer Association Director
Korean Gastric Cancer Association, International Affair Board Executive Director
International Gastric Cancer Association, Member
Korean Laparoscopic Gastointestinal Surgery Study (KLASS) Consultant
Korean Society of Endoscopic & Laparoscopic Surgeon (KSELS), Director
Accreditation committee
Endoscopic and Laparoscopic Surgeons of Asia (ELSA) Member
World Journal of Gastrointestinal surgery Editorial Board
Journal of Chinese Clinical Medicine (JCCM) Editorial Board
Society of American Gastrointestinal and Endoscopic Surgeons (SAGES) Member
Fellowship Consortium on Advanced Laparoscopic Surgery (FoCALS) Member
World Journal of Gastroenterology Editorial Board
Annals of Laparoscopic and Endoscopic Surgery Editorial Board
Gastric Cancer Editorial Board