Ronenn trained in internal medicine, epidemiology, and rheumatology at Johns Hopkins, and did postdoctoral training in inflammation and nutrition at Tufts University. He is currently Global Head of Translational Medicine Discovery and Profiling at Novartis Institutes for Biomedical Research (NIBR), based in Basel, Switzerland. He is also Adjunct Professor of Medicine and Nutrition at Tufts. He is an internationally recognized authority on sarcopenia, translational medicine, and the use of biomarkers in drug development. He has published over 270 papers in the medical literature (h-index 100), as well as writing for lay audiences. He has won multiple awards, including membership in the Alpha Omega Alpha and Delta Omega honor societies; Fellow of the American College of Physicians and the American College of Rheumatology; and the Robert H. Herman Memorial Award of the American Society for Nutrition.