Joan E. Spero, 63, is president of the Doris Duke Charitable Foundation.

Ms. Spero served as U.S. Ambassador to the United Nations for Economic and Social Affairs from 1980 to 1981. From 1981 to 1993 she held several positions with American Express Company, the last being EVP, corporate affairs and communications.

From 1993 to 1996 Ms. Spero served as U.S. undersecretary of state for economic, business and agricultural affairs, and she assumed her current position with the Doris Duke Charitable Foundation in 1997.

She is a director of the Council on Foreign Relations, a member of the International Advisory Board of Toyota Motors and a trustee of Columbia University and the Wisconsin Alumni Research Foundation.

-- Bio source: SEC proxy statements

Samuel J. Palmisano, 56, is chairman of the board, president and CEO of IBM and chair of IBM's executive committee.

Mr. Palmisano joined IBM in 1973. He was elected SVP and group executive of the Personal Systems Group in 1997, senior VP and group executive of IBM Global Services in 1998, senior vice president and group executive of Enterprise Systems in 1999, president and chief operating officer in 2000, chief executive officer in 2002 and chairman of the Board in 2003.

Mr. Palmisano is a director of Exxon Mobil Corporation.

-- Bio source: SEC proxy statements