- Ajou University Hospital Intern
- Ajou University Hospital surgical resident
- Clinical instructor of colorectal surgery at Ajou University Hospital
- Assistant professor of colorectal surgery at Ajou University Hospital
- Clinical Assistant Professor, International St. Mary’s Hospital, Catholic Kwandong University
- Recognized doctor and regular member of the Korean Society of Oncological Surgery
- Regular member of the Korean Society of Endoscopic and Laparoscopic Surgery
- Regular member of the Korean Surgical Society
- Regular member of the Korean Society of Colon and Proctology
