Xujia Liu is a Ph.D. student in the Industrial Engineering and Operations Research (IEOR) department at Columbia University. He received his B.Eng. in Systems Engineering and Engineering Management from The Chinese University of Hong Kong (CUHK) in 2013, and M.Sc. in Financial Engineering from IEOR in 2017. He is currently working with Professor Garud Iyengar on applications of optimization and dynamic programming, such as portfolio optimization and inventory management.