Graham A. Colditz, MD, DrPH is the Niess-Gain Professor of Surgery, Professor of Medicine; Chief, Division of Public Health Sciences, Department of Surgery; Deputy Director, Institute for Public Health, Washington University in St. Louis and Member, Institute of Medicine. He earned his medical degree from University of Queensland and his Doctor of Public Health degree from Harvard School of Public Health. Dr. Colditz is an internationally-known epidemiologist and Associate Director for Prevention and Control at the Alvin J. Siteman Cancer Center, Washington University School of Medicine and Barnes-Jewish Hospital, St. Louis, Missouri. Dr. Colditz’s leadership has broadened the scope of prevention research, education and community outreach and markedly raised the profile of the Washington University School of Medicine’s public and population health initiatives. With a commitment to identifying preventable causes of chronic disease among women and adolescents, Dr. Colditz continues to study benign breast disease and other markers for risk of breast cancer. He developed the award-winning Your Disease Risk website, which communicates tailored prevention messages to the public. He has published over 850 peer-reviewed publications, six books and six reports for the Institute of Medicine, National Academies of Health. He was the editor-in-chief of the journal Cancer Causes and Control and has contributed to reports of the Surgeon General on Tobacco and Health. He has served on several committees for the National Academies of Science and the National Cancer Institute, among others. In October 2006, on the basis of professional achievement and commitment to public health, Dr. Colditz was elected to membership of the Institute of Medicine, an independent body that advises the U.S. government on issues affecting public health.