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Zhaohong Han is an experienced Engineering Manager II specializing in Machine Learning Engineering, currently leading efforts in ads ranking at Pinterest. Previously, Zhaohong held the position of Tech Lead for Machine Learning Engineering at TikTok and served as a Senior Process Engineer at Lam Research, where they contributed to the development of innovative processes in semiconductor manufacturing. Zhaohong earned a Ph.D. in Materials Science from the Massachusetts Institute of Technology and a Bachelor of Engineering from Tsinghua University. Their research background includes work as a Visiting Scholar at Stanford University and a Research Assistant at MIT, where they focused on advanced optical and infrared sensor technologies.