Biography :
• 1994-1995 Clinical Instructor, Department of Obstetrics & Gynecology, Asan Medical Center, Seoul, Korea
• 1995-1997 Instructor-Lecturer, Department of Obstetrics & Gynecology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea
• 1997-2001 Assistant Professor, Department of Obstetrics & Gynecology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea
• 2000-2001 Research scholar in Center for Research on Reproduction and Women's Health, Department of Obstetrics & Gynecology, University of Pennsylvania Medical Center (Research using Bill and Melinda Gates Fund)
• 2001-2006 Associate Professor, Department of Obstetrics & Gynecology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea
• 2006-2018 Professor, Department of Obstetrics & Gynecology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea
• 1997-2018 Director, Clinic for Reproductive Medicine and Infertility, Division of Reproductive Endocrinology and Infertility, Department of Obstetrics & Gynecology, Asan Medical Center, Seoul, Korea