Graduate School of Medicine, Seoul National University,South Korea Resident, Department of Dermatology, Samsung Medical Center, South Korea Clinical Assistant Professor, Department of Dermatology, Samsung Medical Center Associated Professor and Chairman, Department of Dermatology, Kangbuk Samsung Hospital, Sungkyunkwan University School of MedicineMember of Korean Dermatological Association Director of Korean Society for Photomedicine Director of the Korean Society for Aesthetic and Surgical Dermatology