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In our annual HealthLeaders 20, we profile individuals who are changing healthcare for the better. Some are longtime industry fixtures; others would clearly be considered outsiders. Meet them all in this image gallery.
Professor of Medicine and Medical Sociology
Harvard Medical School
Cambridge, MA
For the past decade, Nicholas Christakis, MD, has been studying human social networks and their effects on health. These aren't Facebook-style networks. He analyzes old-fashioned face-to-face networks.
