PhD, Iowa State University; DVM, Tehran University. Professor of nutrition and immunology. Director, USDA Human Nutrition Research Center on Aging, Tufts University. President, American Society of Nutrition (ASN). Former President, American Aging Association (AGE). Has published extensively on nutrition's impact on ageing, inflammation, host defence and infections. Recipient of honours incl.: AGE Lifetime Research Achievement Award; ASN Herman Award in Clinical Nutrition.