Stephen Ragain is an accomplished machine learning engineer with a current position as Staff Machine Learning Engineer at Reddit, Inc., focusing on core ranking and content recommendation since January 2023. Previously, Stephen held the role of Senior Machine Learning Engineer at Twitter from September 2019 to November 2022, contributing to the Cortex User Modeling Research team and driving user engagement through applied research. Educationally, Stephen earned a Ph.D. in Operations Research from Stanford University, where research centered on modeling choices and rankings, and a Bachelor's degree in Mathematics from Pomona College. Early experience includes roles at Pomona College as a Math Mentor and various research positions, including a Researcher role at HHMI SURP and a Data Science Internship at Twitter.
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