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Justin Ng is a seasoned data scientist with extensive experience in machine learning and user segmentation at YouTube since December 2018. Prior to this role, Justin worked at Google as a statistician, where responsibilities included designing experiments and estimating heterogeneous causal effects using machine learning and natural language processing from January 2016 to December 2018. Earlier in Justin's career, experience as an associate at Cornerstone Research occurred from August 2013 to December 2015. Justin completed a Doctor of Philosophy (PhD) in Managerial Economics and Strategy at the Kellogg School of Management, Northwestern University, from 2008 to 2013 and earned a Bachelor's degree in Managerial Economics from the University of California, Davis, from 2004 to 2008.