Dr. Matsumoto is a Professor Emeritus in the Department of Medicine, Division of Gerontology and Geriatric Medicine at the University of Washington, School of Medicine in Seattle, Washington. Formerly, he served as Director of the Clinical Research Unit; Associate Director of the Geriatric Research, Education and Clinical Center (GRECC) and an Attending Physician in Internal Medicine, Geriatric Medicine and Endocrinology & Metabolism at the Department of Veterans Affairs Puget Sound Health Care System (VAPSHCS) in Seattle. He continues to serve as a Clinical Investigator in the GRECC and Vice President of the Board of Directors of the Seattle Institute for Biomedical and Clinical Research at the VAPSHCS.
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 193 peer-reviewed, original research papers, and over 93 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 a 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 previously as the Chair of the Laureate Awards Committee of the Endocrine Society, 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 Reproductive Endocrinology Study Section, NIH 1990-1994 and Population Research Subcommittee, NICHD Initial Review Group 1996-2000; member of the Therapeutic Exemption Committee of the United States Anti-Doping Agency (USADA); and. an Editor for the Journal of Clinical Endocrinology & Metabolism 2015-2019. Currently, he serves as a Section Editor for Male Reproductive Endocrinology for UpToDate and member of the USADA Board of Directors . Dr. Matsumoto was awarded the Sidney H. Ingbar Distinguished Service Award from The Endocrine Society in 2012, Mayo Soley Award for lifetime achievement in medical research and mentorship from the Western Society for Clinical Investigation in 2018, and the Jack Michaels Award for Excellence in VA Research from the Northwest Paralyzed Veterans of America in 2018. He is a Fellow of the American College of Physicians.