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Lei Chen is a founding member of our company and has served as our chief executive officer since July 2020. Mr. Chen served as our chief technology officer since 2016 and as our director from February 2017 to July 2018. Prior to joining our company, Mr. Chen served as chief technology officer of Xinyoudi Studio since 2011. Mr. Chen's prior working experience includes internships with Google (Nasdaq: GOOG), Yahoo Inc. and IBM (NYSE: IBM) in the United States. Mr. Chen was trained as a data scientist and is a prolific publisher on the subject of data mining, and has presented his works in large international conferences, such as the ACM SIGMOD Conference, Very Large Data Bases (VLDB) Conferences and International Conference on Machine Learning. Mr. Chen received his bachelor's degree in computer science from Tsinghua University and his doctoral degree in computer science from University of Wisconsin-Madison.