Koki Arai is Professor and Dean of the Faculty of Business Studies at Kyoritsu Women’s University in Tokyo. His research focuses on law and economics, industrial organization, and competition policy, with particular emphasis on digital-market regulation, public procurement, and the relationship between legitimacy and enforcement design. Before entering academia, he served in senior positions at the Japan Fair Trade Commission, including Head of the Economic Research Office and Deputy Director of the Competition Policy Research Center, and also worked as First Secretary at the Embassy of Japan in the United States. He previously held a faculty appointment at Osaka University’s Institute of Social and Economic Research. He earned his Ph.D. in Economics from Osaka University and a B.A. in Economics from Waseda University. His recent publications include Law and Economics in Japanese Competition Policy (Springer, 2019) and Digitalization and Competition Policy in Japan (Springer Nature, 2024).