Dr. Ezekiel J. Emanuel explains how the Affordable Care Act reforms are reshaping the health care system. He also looks at why health care in America has become such a divisive social issue and why reform has bedeviled presidents of the left and right for more than a century. Dr. Emanuel is a professor of medical ethics and health policy at the University of Pennsylvania and served as a special adviser to the White House on health care reform. He’s the author of Reinventing American Healthcare: How the Affordable Care Act Will Improve Our Terribly Complex. Blatantly Unjust, Outrageously Expensive, Grossly Inefficient, Error Prone System.