Index

Independent Directors:

Click Directors' name for additional information.

	Frederick M. Bernthal Washington, D.C. President Universities Research Association Age: 66 Director since 1997 Chair, Nuclear Oversight Committee
	John W. Conway Philadelphia, Pa. Chairman of the Board, President and Chief Executive Officer Crown Holdings, Inc. Age: 63 Director since 2000
	E. Allen Deaver Lancaster, Pa. Former Executive Vice President and Director Armstrong World Industries, Inc. Age: 73 Director since 1991 Lead Director Chair, Compensation, Governance and Nominating Committee
	Louise K. Goeser Mexico City, Mexico President and Chief Executive Officer Grupo Siemens S.A. de C.V. Age: 55 Director since 2003
	Stuart E. Graham Vero Beach, Fla. Chairman Skanska USA Inc. Age: 63 Director since 2008
	Stuart Heydt Hershey, Pa. Former Chief Executive Officer Geisinger Health System Age: 69 Director since 1991 Chair, Audit Committee
	Craig A. Rogerson Middlebury, Conn. Chairman, President and Chief Executive Officer Chemtura Corporation Age: 52 Director since 2005
	W. Keith Smith Pittsburgh, Pa. Former Vice Chairman Mellon Financial Corporation Age: 74 Director since 2000 Chair, Finance Committee
	Keith H. Williamson St. Louis, Mo. Senior Vice President, Secretary and General Counsel Centene Corporation Age: 56 Director since 2005

Management Directors:
Click Director's name for additional information.

James H. Miller
Allentown, Pa.
Chairman, President and Chief Executive Officer
PPL Corporation
Age: 60
Director since 2005

Directors’ ages are as of April 8, 2009.