On March 12, 2017, Prof. Yinyu Ye, Chair Professor of Engineering at Department of Management Science and Engineering and Institute of Computational and Mathematical Engineering, gave a talk entitled “Data, Optimization and Decision Making”. It is highly educational and quite fascinating. Prof. Ye focused his presentation of how to use optimization methods and related machine learning tools for better decision making on supply-chain management, electronic commerce, financial risk management, transportation, sensor network, big data, among other things. The talk lasted 1.5 hours followed by many questions. There were around 80 attendees ranging from college students to seniors including a 90+ year old lady.