Stephen Guo is an accomplished engineering leader with a specialization in machine learning (ML) and data science. Guo has a Bachelor of Science (BS) and is a Ph.D. candidate in computer science, both from Stanford University. He has also pursued a Master of Science (MSc) in computer science from Stanford. Guo's professional background includes several notable organizations, such as his current role as the director of machine learning for advertising technology at Walmart Global Tech. Prior to this, Guo was a junior founder at Root-1 Research and a quantitative trader at JPMorgan Chase & Co. His interests center around a few key areas, including recommender systems and personalization, information retrieval, advertising technology, and innovative applications such as voice and visual.