Corporate governance: Board of Directors

		Frank M. Clark Chairman and Chief Executive Officer Commonwealth Edison
Director of Aetna since 2006  Frank M. Clark is Chairman and Chief Executive Officer of Commonwealth Edison Company (“ComEd”) (an electric energy distribution subsidiary of Exelon Corporation), a position he has held since November 2005.  Mr. Clark served as President of ComEd from October 2001 to 2005 and served as Executive Vice President and Chief of Staff to the Exelon Corporation Chairman from 2004 to 2005. Since joining ComEd in 1966, Mr. Clark has risen steadily through the ranks, holding key leadership positions in operational and policy-related responsibilities, including regulatory and governmental affairs, customer service operations, marketing and sales, information technology, human resources and labor relations, and distribution support services. Mr. Clark is non-executive chairman of Harris Financial Corporation (financial services) and a director of Waste Management, Inc. (waste disposal services).