Nathan Stoltzfusis from the United States. He holds a dual Bachelor's degree in Mathematics and Economics from Penn State University, with a minor in Chinese, and previously participated in the Peking University Summer Chinese Language Program, giving him a solid interdisciplinary academic foundation and strong Chinese language proficiency (HSK Level 5). He has over eight years of experience in international education, He excels in teaching multiple AP subjects including Economics and Statistics, consistently achieving top scores. He is also skilled at integrating computer science (Python, Java, R, etc.) into probability simulation instruction and has extensive experience teaching Gaokao English and TOEFL. He holds a 120-hour TESOL Master Certificate and is a certified Chinese-to-English translator accredited by the American Translators Association. He is a versatile senior education specialist who combines mathematical logic, economic analysis, language translation, and modern technological application skills.