He received his Ph.D. at MIT Mathematics in June 2009. During summers of his Ph.D., he has worked in Microsoft Research Cambridge (2008), IBM Watson Research (2007), Bell Labs (2006), and Samsung Advanced Institute of Technology (2005) respectively. His main research interest includes optimization problems in statistical inference, computational learning theory, and resource allocation in communication networks. He received B.Sc. in Mathematics from Seoul National Univ. in 2003, and he was an IMO(International Mathematical Olympiad) gold medalist in 1995.