- Severance Hospital Education and Training Department Intern
- Severance Hospital Pediatrics Resident
- Clinical medicine instructor, Department of Pediatrics, Yonsei University College of Medicine
- Yongin Severance Hospital Pediatrics Specialist
- Gangnam Severance Hospital pediatric specialist
- Clinical Assistant Professor, Department of Pediatrics, Yonsei University College of Medicine
- Associate Professor, Catholic Kwandong University International St. Mary's Hospital
