Dr. Andrew Ray is a Senior Data Engineer at Silicon Valley Data Science. He is passionate about big data and has extensive experience working with Spark. Andrew is an active contributor to the Apache Spark project including SparkSQL and GraphX. Prior to joining SVDS, Andrew was a Data Scientist at Walmart, where he built an analytics platform on Hadoop that integrated data from multiple retail channels using fuzzy matching. Andrew also led the adoption of Spark at Walmart from proof of concept to production. Andrew earned his Ph.D. in Mathematics from the University of Nebraska, where he worked on extremal graph theory.