- Severance Hospital Resident
- Former lecturer, assistant, associate professor, Cha Hospital
- Director of Catholic Kwandong University International St. Mary's Hospital Customized Cancer Healing Hospital
- Vice-Director of Catholic Kwandong University International St. Mary's Hospital
- Director of the Medical Center at Catholic Kwandong University International St. Mary's Hospital
- Professor at Catholic Kwandong University International St. Mary's Hospital
- Regular member of the German Surgical Society
- Member of the Korean Society of Hepatobiliary and Pancreatic Surgery
- Member of the Korean Laparoscopic Surgery Society
- Served as an educational committee member of the Korean Surgical Society
