- Professor Dermatology, Samsung Medical Center, Sungkyunkwan University, Seoul, Korea
- Director for education program in Korean Dermatological Association
- American Academy of Dermatology, Council for Nail Disorders
- Diplomate, International Board of Dermatopathology
- Visiting scholar, Department of Dermatology, UCSD, San Diego, CA, USA (2006-2008)
- Ph.D., Seoul National University, College of Medicine