Dr. Yi Zhao is the chairman and chief physician of dermatology department of Beijing Tsinghua Changgung Hospital, associate professor of School of Clinical Medicine, Tsinghua University. He has been a research scholar in the department of dermatology of Vienna Medical University, Austria. He is extensively experienced in management of skin disease and application of phototherapy, laser and photodynamic therapy in dermatology. His major research interests include psoriasis, phototherapy, laser and photodynamic therapy. He has published over 50 peer reviewed papers, has been in editor board of six dermatological books, and has been involved in many multicenter clinical trials on skin diseases. Three of his research projects was supported by National Natural Science Foundation of China.