- Severance Hospital clinical instructor
- France Pasteur Institute
- Research assistant professor at Korea Advanced Institute of Science and Technology
- Research assistant professor at Ajou University Hospital
- Department of Infectious Diseases, Catholic Kwandong University International St. Mary's Hospital
- Professor at Catholic Kwandong University International St. Mary's Hospital
- Member of the Korean AIDS Society Medical Guidelines Committee
- Incheon City Infectious Disease Control Support Group Advisory Committee Member
- Member of the Korean Society for Healthcare-Associated Infection Control
- Member of the Korean Society of Internal Medicine
- Member of the Korean Society of Infectious Diseases
- Member of the Korean Vaccine Society
