- Severance Hospital Resident
- Research instructor at Yeongdong Severance Hospital
- Director of the Liver Center at Catholic Kwandong University International St. Mary's Hospital
- Director of Digestive, Biliary and Pancreatic Center at Catholic Kwandong University International St. Mary's Hospital
- Professor at Catholic Kwandong University International St. Mary's Hospital
- Korean Society of Liver Studies
- Korean Society of Internal Medicine
- Korean Society of Gastroenterology
