Jena is a physician and economist whose research includes the economics of physician behavior, the physician workforce, healthcare productivity and medical innovation, as well as medical malpractice. He is a faculty research fellow at the National Bureau of Economic Research and an internist at Massachusetts General Hospital in Boston. He recently co-authored a study in the New England Journal of Medicine demonstrating that the number of gun injuries in the U.S. decreases during the National Rifle Association's annual convention.
Also featured on this list are Harvard Medical School faculty Elizabeth Nabel, MD, professor of medicine and president of Brigham Health, Peter Slavin, MD, professor of health care policy and president of Massachusetts General Hospital, David Torchiana, MD, associate professor of surgery and president and CEO of Partners HealthCare, and Atul Gawande, MD, professor in the department of health policy and management at the Harvard T.H. Chan School of Public Health.