Nick Pentreath is a principal engineer in IBM's Cognitive Open Technology Group, where he works on open-source machine learning projects. Previously, he cofounded Graphflow, a machine learning startup focused on recommendations. He is a committer and PMC member of the Apache Spark project and author of Machine Learning with Spark. He has worked at Goldman Sachs, Cognitive Match, and led the Data Science team at Mxit, Africa’s largest social network. Nick is passionate about combining commercial focus with machine learning and cutting-edge technology to build intelligent systems that learn from data to add business value.