- Researcher, Department of Dermatology, Sinchon Severance Hospital
- Associate Professor, Department of Dermatology, Yonsei University College of Medicine
- Professor, Department of Dermatology, Yonsei University College of Medicine
- Medical professor at Catholic Kwandong University International St. Mary's Hospital
- Korean Society of Dermatology/Korean Society of Dermatological Research
- Secretary General of Severance New Hospital Supporters' Association
- 4th Chairman of the Korean Society for Skin Research
- Academic Director, Korean Dermatological Association
- President of the Korean Behcet's Disease Society
