Dr. Jun Yong Choi is an Associate Professor of Yonsei University College of Medicine, Seoul, South Korea. He is currently a Director of AIDS Research Institute of Yonsei University, and Chief of Division of Infectious Diseases, Severance Hospital, Seoul, South Korea. He has been an investigator of the TREAT Asia HIV Observational Database (TAHOD), and a member of steering committee of TAHOD. He has worked as a leading person of the academic society about HIV infection of South Korea and as a member of board of directors of Korean Society for AIDS and Korean Society for Infectious Diseases. A key priority for his clinical and scientific work has been to improve the local understanding of the HIV epidemic in South Korea and translational virology for understanding molecular characteristics of HIV. He published over 100 peer reviewed papers. His work has developed a mathematical model of HIV infection among MSM in South Korea, and the model shows the predictions of HIV incidence and prevalence in South Korea. In addition, his work developed less costly but still accurate methods for monitoring virologic responses in HIV infected persons. And, he investigated the prevalence and risk factors of HIV-associated neurocognitive disorder and tuberculosis in HIV-infected Koreans. The data on communicable and non-communicable diseases in HIV infected Koreans could be used to develop strategies on prevention and treatment of those comorbidities in HIV-infected persons in South Korea.