- Severance Hospital Resident
- Severance Hospital clinical instructor
- Clinical instructor at Incheon St. Mary's Hospital
- Gangseo Mizmedi Hospital, Chief of Medical Services
- Clinical Associate Professor, International St. Mary's Hospital, Catholic Kwandong University
- Korean Diabetes Association
- Korean Endocrine Society
- Korean Society of Obesity
- Korean Society of Pediatric Endocrinology
- Korean Academy of Pediatrics
