Dr. Matsumoto received his medical degree in 1975 from the University of Washington School of Medicine in Seattle. Following his residency and chief residency in internal medicine at the University of Washington School of Medicine Affiliated Hospitals from 1975-1979, he was a senior fellow in Medicine/Endocrinology & Metabolism at the University of Washington School of Medicine from 1979-1982. Dr. Matsumoto is a diplomat of the American Board of Endocrinology and Metabolism and American Board of Internal Medicine.
Dr. Matsumoto has written 166 peer-reviewed, original research papers, and over 88 invited reviews and book chapters. His research has focused on physiological and clinical effects of testosterone in aging men, diagnosis and treatment of male hypogonadism, endocrine control of spermatogenesis and testis function, male contraceptive development, and the neuroendocrine regulation of reproductive function, energy balance, and body composition.
Dr. Matsumoto is active in numerous specialty societies. Currently, he is Chair of the Laureate Awards Committee and member of the Task Force for Clinical Practice Guidelines on Testosterone Treatment of Men with Hypogonadism of The Endocrine Society and Co-Chair of the Partnership for the Accurate Testing of Hormones (PATH). He served as the Clinical Program Chair for the 2001 Endocrine Society Annual Meeting and 2007 American Society of Andrology Annual Meeting. He has been a member of the Population Research Subcommittee, NICHD Initial Review Group 1996-2000 and the Reproductive Endocrinology Study Section, NIH 1990-1994. Currently, he serves as an Editor for the Journal of Clinical Endocrinology & Metabolism and a Section Editor for Male Reproductive Endocrinology for UpToDate and has served on the Research Policy Advisory Committee of the United States Anti-Doping Agency.