- Severance Hospital Intern
- Gangnam Severance Hospital resident
- Clinical instructor at Gangnam Severance Hospital
- Deputy Director, PI, Catholic Kwandong University International St. Mary's Hospital
- Department of Otolaryngology-Head and Neck Surgery, Catholic Kwandong University International St. Mary's Hospital
- PI Director, Catholic Kwandong University International St. Mary's Hospital
- Clinical Associate Professor, International St. Mary’s Hospital, Catholic Kwandong University
