- Catholic Central Medical Center Intern
- Assistant Professor, Department of Radiology, Incheon St. Mary's Hospital
- Resident, Department of Radiology, Catholic Medical Center
- Associate Professor, Professor, Department of Radiology, Yeouido St. Mary's Hospital
- Professor Emeritus, Department of Radiology, St. Paul's Hospital
- Medical professor at Catholic Kwandong University International St. Mary's Hospital
