- Wonju Christian Hospital Resident
- Severance Hospital Assistant Professor
- Konyang University Hospital Assistant, Associate, Professor
- Professor at Incheon St. Mary's Hospital
- Director of the Medical Cooperation Center at Catholic Kwandong University International St. Mary’s Hospital
- Vice-Director of Catholic Kwandong University International St. Mary's Hospital
- Director of the Cardiovascular Center at Catholic Kwandong University International St. Mary's Hospital
- Department of Cardiovascular and Thoracic Surgery, 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
