Vivian E. Riefberg has served as a Director of the Company since February 2020. Since August 2020, she has served as the David C. Walentas Jefferson Scholars Foundation Professorship Chair and is a Professor of Practice at the University of Virginia Darden School of Business. Prior to this, from September 1987 to May 2020, Ms. Riefberg was at McKinsey & Company and held a variety of senior positions, including leading the Public Sector Practice for the Americas and co-leading the U.S. Health Care practice. She currently serves as an Emeritus Director and Senior Advisor with McKinsey & Company since June 2020. In 2018, Ms. Riefberg was elected as a Director to the Board of the Public Broadcasting Service. She also serves on the Board of Johns Hopkins Medicine since July 2020. She was previously on the Board of Governors for the NIH Clinical Center and was a Director on the Boards for the Partnership for a Healthier America, Mentors, Inc. and McKinsey & Company. Ms. Riefberg holds an MBA from Harvard Business School and a BA in History from Harvard University.