Dr. Yan Xie is a senior Clinical Epidemiologist and Chief of the Division of Pharmacoepidemiology at the VA Saint Louis Health Care System Clinical Epidemiology Center. Dr. Xie has made significant contributions in understanding the short-term and long-term health consequences of COVID-19. His work in this area has been widely recognized and published in prestigious journals including Nature, Nature Medicine, JAMA and the BMJ, among others. His work also received substantial attention from the general public, with coverage in hundreds of global news outlets such as The New York Times, CNN, The Guardian, and more. The relevance and impact of his work extended to government agencies and was supported by patient communities, leading to changes in patient care. In addition to his work on COVID-19, his pharmacoepidemiology research leverages advances in causal inference and health metrics to understand the comparative effectiveness and risks of commonly used treatments.