background and operational experience to understand and to provide guidance in evaluating complex business and financial issues facing large public companies. His strategic and financial perspective, and long involvement with government and international operations, brings a valuable perspective to our Board and to his leadership as chair of our Audit Committee.

ALBERT D. McALISTER Board Committees: Private Directorships: Age: 60 • Compensation • McAlister & McAlister Director Since: April 1990 • Nominating and Corporate • President’s Advisory Board, Governance Clemson University • Executive

Since 1975, Mr. McAlister has been a partner in the law firm of McAlister &McAlister in Laurens, South Carolina. Mr. McAlister is a director of a private charitable foundation and a member of the Clemson University – President’s Advisory Board.

Mr. McAlister contributes to our Board the skills and experience gained from his years of legal service to various businesses and corporations and as a litigator. As a founder of his firm, he has sophisticated legal experience and a reputation for resolving complex legal matters. Having joined our Company at its inception, he is a repository of institutional knowledge and historical perspective and has been a key advisor to our management as we have grown from a start-up to a Fortune 500 company.

STEPHEN R. TRITCH Board Committees: Public Directorships: Age: 62 • Nominating and Corporate • Koppers Holdings, Inc. Director Since: April 2009 Governance Private Directorships: • PaR Systems • Board of Trustees, University of (Chair) • Board of Trustees, Senator John History Center, Pittsburgh, PA • UPMC Health System

Mr. Tritch is the retired Chairman of Westinghouse Electric Company (Westinghouse) and served in that capacity from July 1, 2008, to July 1, 2010. Westinghouse is a pioneering nuclear power company and a leading supplier of nuclear plant products and technologies to utilities throughout the world. From July 2002 to July 2008, Mr. Tritch served as President and Chief Executive Officer of Westinghouse. Mr. Tritch had been employed by Westinghouse since 1971. Mr. Tritch was appointed in 2007 by then-President George W. Bush to the President’s Export Council. Mr. Tritch is also chairman of the board of trustees at the University of Pittsburgh; first Vice Chairman of the UPMC Health System; a member of the board of trustees for the Senator John Heinz History Center in Pittsburgh for which he previously served as chairman until July 2010; and a member of the board of directors of Koppers Holdings, Inc. (NYSE: KOP), a publicly-held company and a leading producer of carbon compounds and treated wood products, headquartered in Pittsburgh, . He is also a member of the board of PaR Systems, a privately-held robotic systems supplier, headquartered in Minneapolis, Minnesota.

Mr. Tritch’s experience with Westinghouse, a partner in many of our nuclear plant projects, makes him a valued member of our Board as our Company continues to grow in this field. He brings a wealth of knowledge about the nuclear power industry and understanding of the unique issues involved in this complex and historically significant industry sector. Mr. Tritch’s broad experience with nuclear power technology companies and his insight into global electric power production complement the spectrum of experience on our Board.

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