Department of Dermatology, Yonsei University College of Medicine, Department of Dermatology, Yonsei University College of Medicine, Graduate School of Medicine, Master of Science, Graduate School of Medicine, Yonsei University College of Medicine,

Former Director, Department of Dermatology, Yonsei University, Wonju College of Medicine, Department of Dermatology, Hallym University, Gangnam Sacred Heart Hospital, Department of Dermatology, Department of Dermatology, Department of Academic member of the Korean Dermatological Association Academic director of the Korean Skin Anti-aging Research Society Academic director of the Korean Hair Loss Treatment Society Director of the Korean Hair Transplantation Society Member of the Korean Dermatological Association Member of the Korean Dermatological Research Association Member of the Korean Atopic Dermatitis Association Member of the Korean Skin Barrier Society Member of the Korean Acne Research Society Member of the Korean Hair Society Member of the Asian Hair Transplantation Society Member of the Korean Skin Laser Association Member of the Korean Society of Dermatological Surgery