- Korea University Hospital Intern
- Emergency medicine resident at Korea University Hospital
- Clinical instructor, Department of Emergency Medicine, Korea University Ansan Hospital
- Clinical instructor, Department of Emergency Medicine, Korea University Anam Hospital
- Clinical Assistant Professor, Department of Emergency Medicine, Korea University Anam Hospital
- Clinical Associate Professor, Department of Emergency Medicine, Korea University Anam Hospital
- Associate Professor, Catholic Kwandong University International St. Mary's Hospital
