Troyen A. Brennan, M.D., M.P.H, age 62, is Executive Vice President and Chief Medical Officer of CVS Health Corporation. Prior to joining CVS Health Corporation, Dr. Brennan was Chief Medical Officer of Aetna Inc. From 2000 to 2005, Dr. Brennan served as President and CEO of Brigham and Women's Physician's Organization. In his academic work, he was Professor of Medicine at Harvard Medical School, and Professor of Law and Public Health at Harvard School of Public Health. Dr. Brennan received his M.D. and M.P.H. degrees from Yale Medical School and his J.D. degree from Yale Law School. He completed his internship and residency in internal medicine at Massachusetts General Hospital. He is a member of the Institute of Medicine of the National Academy of Sciences.