Former president - ELSA, Korean HBP Surgical Society, 2015 Asia-Pacific Association for Endoscopic and Laparoscopic Surgeons, Daegu, Korea, and Korean association of Endoscopic and Laparoscopic Surgery.

Honorary chairman - BIT’s 8th Annual World Cancer Congress 2015.

Vice president – IASGO, APASL, congress president of IHPBA2014 Seoul

Member of executive committee - Asia-Pacific HBP surgical association, scientific committee of IHPBA.

Honorary member of Japanese HBP Surgery Association and Indian Endoscopic Surgical Association.

Actively involved in basic and clinical research in liver surgery and laparoscopic surgery.
Published 168 peer reviewed article and wrote 7 medical textbooks.
Associated editor for Journal of Hepato-Gastroenterology.
Member of editorial board of Asian J of Endoscopic Surgery, J of Hepato–Biliary-Pancreatic Sciences, Asian J of Surgery, and Frontiers of Medicine.