Ambac Financial Group, Inc. announced the appointment of Lisa G. Iglesias as a member of its Board of Directors. Ms. Iglesias will be a member of the Boards Audit Committee. The Company also announced that Alexander D. Greene resigned from his position on the Board to pursue other opportunities. Ms. Iglesias, Executive Vice President and General Counsel of Unum Group, has more than 20 years of legal, finance and risk management experience. At Unum, an international provider of workplace benefits and services, she manages the Legal, Enterprise Audit and Corporate Services functions.