William J. Evans, PhD is an Adjunct Professor of Medicine at the Duke University Medical Center and Human Nutrition in the Department of Nutritional Sciences at the University of California, Berkeley.  He was a Vice President and Head of the Muscle Metabolism Discovery Unit at GlaxoSmithKline, a group dedicated to developing new medicines to treat muscle wasting, frailty, and sarcopenia. 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.  He is a Fellow of the American College of Sports Medicine, The American College of Nutrition, and an honorary member of the Academy of Nutrition and Dietetics. 

With an h-index of 120, he is the author or co-author of more than 300 publications in scientific journals and was the first to describe sarcopenia.  Along with Irwin Rosenberg, he is the author of the bestseller, Biomarkers: The Ten Determinants of Aging You Can Control (Simon & Schuster) and authored AstroFit (Simon & Schuster, 2002). His studies have demonstrated the ability of older men and women to improve strength, fitness, and health through exercise, even into the 10th decade of life.  His research has examined the effects of bed rest on body composition, muscle metabolism and functional capacity in old men and women, biomarkers for changes in muscle mass and function, and the etiology of late life dysfunction.  He is the co-inventor of 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.  He was invited to testify before the US senate select committee on Aging on strategies to preserve Medicare through prevention. He is a founding member of the Society for Sarcopenia, Cachexia, and Wasting Disorders.