Ms. Gregg retired as Chief Executive Officer of Blue Cross Blue Shield of Tennessee in 2012. Prior to becoming CEO in 2003, Ms. Gregg served in a number of other leadership roles, including President and Chief Operating Officer. Before that, she held a series of senior roles at Humana Health Plans. Ms. Gregg served as a member of the U.S. National Institutes of Health Commission on Systemic Interoperability. She currently serves on the Boards of TeamHealth Holdings, Inc. and the Electric Power Board of Chattanooga. Previously, Ms. Gregg served on several national boards, including First Horizon National Corporation, America’s Health Insurance Plans (Chair 2010-2011), the BlueCross BlueShield Association, the National Institute for Healthcare Management (Chair 2012), and the Healthcare Leadership Council. She has been a director of Quest Diagnostics since July 2014. She has extensive executive and advisory experience, including in general management and strategic planning, with a range of health care organizations, and extensive experience with healthcare issues and the operation of the U.S. healthcare system, including as a practicing nurse.