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Yan Liu is a highly experienced data professional currently serving as a Senior Data Scientist at Block since June 2021. Prior to this role, Yan held the position of Senior Data Analyst at eBay from March 2019 to June 2021, where responsibilities included conducting A/B tests in paid search and app download channels to inform strategic decision-making. Earlier experience includes working as a Data Science Statistical Analyst at Circana, where Yan performed various statistical research studies, and as a Data Visualization/Statistics Intern at Scopio, focusing on database management and dashboard creation. Additional roles included a Data Intern position at Royal Canin and a Research Assistant - Data Analyst position at Shanghai Advanced Institute of Finance at SJTU. Yan Liu holds a Master’s Degree in Statistics from Columbia University and dual Bachelor’s Degrees in Mathematics and Economics from Shanghai Jiao Tong University.