Professor Jungsik (Jason) Song is a Professor of Medicine in the Division of Rheumatology at Yonsei University, Seoul, Korea. He received his M.D., M.S., and Ph.D. from Yonsei University and completed further training in internal medicine and rheumatology at MetroWest Medical Center and Stanford University, where he also served as a postdoctoral fellow and instructor. Dr. Song is board-certified in internal medicine and rheumatology in both Korea and the United States. His research focuses on autoimmune diseases, particularly the immunopathogenesis of rheumatoid arthritis and systemic lupus erythematosus, with an emphasis on immune regulation and metabolic pathways.