Dr. Woo Sik Lee is a Head of CHA Fertility Center in CHA Gangnam Medical Center and also a Professor of the Department of Obstetrics and Gynecology, College of Medicine, CHA University in Seoul, Korea. He performed Fellowship at University of California San Diego, Reproductive Medicine in 2001 and received Ph.D. degree from school of life science and biotechnology, Korea University, Seoul, Korea in 2003. Dr. Lee’s research is mainly focused on ovarian physiology associated with the treatment of patients with ovarian dysfunction. Especially, he and his team have recently revealed mechanism of chemotherapy induced premature ovarian failure with substance to suppress its mechanism. Also, he has focused on the activation of primordial follicle in menopausal patients to search for extension of fertility.