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Harold (Hal) Sox, MD, is Program Director of Peer Review at the Patient-Centered Outcomes Research Institute (PCORI).

A general internist and clinical epidemiologist, Sox has 50 years of experience in patient care, clinical research, medical editing, and program leadership. His research has been in medical decision-making: specifically, the development and validation of clinical prediction rules, cognitive biases in decision making, and utility assessment. He has published more than 250 articles, editorials, book chapters and books, including the textbook Medical Decision Making, which is now in a second edition.

Sox previously was chair of the department of medicine at Geisel School of Medicine at Dartmouth College. He chaired the US Preventive Services Task Force, the Medicare Coverage Advisory Committee, and four study committees of the National Academy of Medicine, including one that set national priorities for comparative effectiveness research. He has been president of the American College of Physicians and the Society for Medical Decision Making. He was editor-in-chief of Annals of Internal Medicine and a member of the editorial boards of JAMA and the New England Journal of Medicine. He was elected to the National Academy of Medicine in 1993.