- Catholic Medical Center Intern
- Catholic Medical Center Resident
- Clinical instructor at Seoul St. Mary's Hospital
- Clinical instructor at Yeouido St. Mary's Hospital
- Clinical assistant professor at Yeouido St. Mary’s Hospital
- Public Relations Director, Catholic Kwandong University International St. Mary's Hospital
- Department of Urology, Catholic Kwandong University International St. Mary's Hospital
- Professor at Catholic Kwandong University International St. Mary's Hospital
