Prof. Dr. Tatag Yuli Eko Siswono, S.Pd., M.Pd., a distinguished faculty member at Universitas Negeri Surabaya (Unesa), was born in Jember on July 8, 1971. He is renowned for his contributions to mathematics education, teaching 29 courses annually. His research primarily focuses on enhancing students' creative thinking abilities through problem-solving and problem-posing in mathematics. Additionally, Prof. Tatag investigates the cognitive processes underlying students' creative thinking and mathematical communication skills. He has published 299 articles in reputable journals and actively participates in community service projects to improve education quality. With 25 books and 11 Intellectual Property Rights (IPR) to his name, Prof. Tatag shares his expertise widely through 46 scientific seminars.