Doctor of Philosophy in Engineering, Osaka University
Master of Engineering, Waseda University
Bachelor of Engineering, Waseda University

Toshimitsu Hamasaki is a Professor of the George Washington University (GWU) Biostatistics Center and the Department of Biostatistics and Bioinformatics. Prior to joining GWU, he worked at Shiogoni, Pfizer, Osaka University and National Cerebral and Cardiovascular Center. His research interests include the design, monitoring, analyses, and reporting of clinical trials. He is the author of more than 200 peer-reviewed publications and four textbooks on statistical methods in clinical trials including "Sample Size Determination in Clinical Trials with Multiple Endpoints" and "Group-Sequential Clinical Trials with Multiple Co-Objectives".

 Dr. Hamasaki is the Editor-in-Chief of Statistics in Biopharmaceutical Research, an Official Publication of the American Statistical Association (ASA) (2000-2025). He also currently serves as an Editor for Statistical Communications in Infectious Diseases (2021- ) and an Associate Editor for Contemporary Clinical Trials (2022- ). He served as an Associate Editor or Editor for several international journals including Statistics in Biopharmaceutical ResearchJournal of Biopharmaceutical StatisticsJapanese Journal of Statistics and Data ScienceCHANCE, and Journal of the Japanese Society of Computational Statistics. He was co-chair of the Society for Clinical Trials (SCT) Program Committee, and the chair of the ASA Committee on International Relation in Statistics. He was a member of the Steering Committee for the Adaptive designs CONSORT Extension (ACE) Project, an extension to the CONsolidated Standards of Reporting Trials (CONSORT) Statement for adaptive clinical trials, and a member of ICH-E5 Guideline Implementation Working Group as a representative of Japan Pharmaceutical Manufacturers Association.

Dr. Hamasaki is an elected member of International Statistical Institute (ISI) and a fellow of the ASA. He received the Distinguished Article Award from the Japanese Society of Computational Statistics and Hida-Mizuno Prize from the Behaviormetric Society of Japan.