Wann-Jiun Ma (PhD Electrical Engineering) is a Postdoctoral Associate at Duke University. His research is focused on mathematical modeling, algorithm design, and software/experiment implementation for large- scale systems such as wireless sensor networks and energy analytics. After having exposed to extensive training and confronted many challenges during his doctoral and postdoctoral study, he has become an experienced and well-trained researcher in data science, which will serve him essentially well as he moves forward to the next stage of his career and turns himself into a data scientist in industry. For his machine learning project at NYC Data Science Academy, he designs a recommendation system and applies that from a business perspective.