Dr. Han completed his medical training, practiced psychiatry and taught courses in general psychiatry and clinical psychometry for medical universities for several years in China, before coming to the United States under ECFMG’s IMSP fellowship in 1994. Subsequently he obtained a MSc and a PhD degree in Epidemiology and Biostatistics from McGill University, Canada. He jointed Yale School of Medicine Department of Internal Medicine in 2001 and now is a Senior Research Scientist and biostatistician with Program on Aging. His main research interests included longitudinal modeling of cognitive and functional decline of older persons, quasi-experimental design and analyses of medications and other interventions, risk assessment for anticholinergic drug exposure and polypharmacy, and multi-level modeling of individual and contextual determinants of health outcomes. His research achievements included two WHO awards for Chinese Young Professionals, the development of common ARC for Alzheimer’s disease progression, the development of clinician rated anticholinergic score for assessing cumulative cognitive burden of anticholinergic medications, and more than 100 peer reviewed research publications as the primary or a coauthor.