David L. Boyle has been a director since August 2005. Mr. Boyle retired as Vice Chairman and Head of Portfolio Risk Management for Ambac Financial Group, Inc. in 2005, where he served in many different executive management capacities for eight years. Previously, Mr. Boyle was a Managing Director at Citibank, N.A. where he had various management responsibilities over a career spanning from 1974 to 1996. He is the former chairman of the Association of Financial Guaranty Insurers, and currently serves on the Board of Trustees of Wittenberg University. Mr. Boyle received a B.S. from Wittenberg University and an M.B.A. from the Fisher College of Business at The Ohio State University.