President of Korean Society of Hernia
Member of Korean Society of Gastrointestinal Surgery
Member of the Korean Surgical society
Member of Korean Gastric Cancer Association
Member of Korean Cancer Association
Member of Korean Society of Endoscopic & Laparoscopic surgeons
Member of Korean Society for parenteral & Enteral Nutrition
Member of Korean Society of Clinical Oncology
Member of Korean Society of Metabolic & Bariatric Surgery