William J. Evans, PhD is an Adjunct Professor of Medicine in the Division of Geriatrics at the Duke University Medical Center and Human Nutrition in the Department of Nutritional Sciences at the University of California, Berkeley.

He previously was Vice President and head of the Muscle Metabolism Discovery Unit at GSK.  He has served as laboratory director at the Reynolds Institute on Aging at the University of Arkansas for Medical Sciences, the Noll Physiological Research Center at Penn State and as the Chief of the Human Physiology Laboratory at the Human Nutrition Research Center on Aging at Tufts University. With an H-index of 124 and more than 77,000 citations he is the author or co-author of more than 350 publications in scientific journals and was the first to describe sarcopenia. He is the co-inventor of the D3Creatine dilution method, a non-invasive and accurate measurement of muscle mass which is strongly related to health outcomes in older people. His work has been featured in the PBS series, NOVA, Good Morning America,  20/20, CBS evening news, CNN, and the New York Times. Dr. Evans has been invited to testify before the US Senate Select Committee on Aging on strategies to save Medicare. He is a founding member of the Society for Sarcopenia, Cachexia, and Wasting Disorders and recently received the Lifetime Achievement Award from the International Conference on Frailty and Sarcopenia Research.