David J. Hunter, MBBS, MPH, ScD, is Dean for Academic Affairs and Vincent L. Gregory Professor of Cancer Prevention at the Harvard T. H. Chan School of Public Health and Professor of Medicine at Harvard Medical School. A medical doctor and epidemiologist from Australia, he has conducted HIV research in East Africa and led international consortia studying nutritional and genetic causes of breast, prostate, and colorectal cancers. Harvey V. Fineberg, MD, PhD, is President of the Gordon and Betty Moore Foundation. He is a former President of the Institute of Medicine (2002-2014), Provost of Harvard University (1997-2001), and Dean of the Harvard School of Public Health (1984-1997).