Ji Chen earned his PhD in Statistics from a joint program at East China Normal University and the University of Wisconsin-Madison. He has been working on nonignorable missing data analysis for his dissertation and has advanced knowledge of diverse statistical techniques such as generalized linear mixed models, Bayesian hierarchical models, survival analysis, and functional data analysis. Before joining CORE, Ji served as a Biostatistician at Novartis and CSPC Pharmaceutical Group and led/supported the statistical activities for various clinical trials in Dermatology, Neuroscience and Oncology.