Yannis is currently a Senior Director of Data Science at Walmart eCommerce. He has led Data Science teams for Sams Club, Walmart.com, Walmart Groceries and now Walmart International (ASDA – UK, Canada, Mexico and Chile) with a focus on improving customer experience and driving business efficiencies and automation. He joined Walmart in 2011, from the acquisition of OneRiot where he was one of the architects of OneRiot’s real time search engine and social media behavioral platform. He was also the co-founder of Personity a presence and availability company which was acquired by Openwave in 2002. He holds a bachelor’s degree in Computer Science from the University of Athens and a Master of Science in Information Networking from Carnegie Mellon University.