Yoon-Sok (Martin) Chung is currently a professor of the Department of Endocrinology and Metabolism at the Ajou University School of Medicine, and Director of the Ajou Institute on Aging at the Ajou University Medical Center, Suwon, South Korea. He graduated from Yonsei University College of Medicine, and trained at the Severance Hospital in Seoul, South Korea. Dr. Chung received PhD degree in growth hormone research at the Yonsei University College of Medicine. His major research interests are basic and clinical aspects of bone and muscle diseases including osteoporosis and sarcopenia. Professor Chung had contributed to medical student education as the Director of the Office of the Medical Education in Ajou University School of Medicine (2010~2018). Among many social and academic organizations related to endocrinology in South Korea, he had been the President of the Korean Society of Osteoporosis (2015~2016) and the current President of the Korean Endocrine Society (2023~2024). He has been appointed as the Editor-in-Chief of the Asian Federation of Osteoporosis Societies (AFOS) Journal (Osteoporosis and Sarcopenia) since 2015. Also, Dr. Chung has served as one of the Associate Editors of the Postgraduate Medical Journal since 2016.