Committees

Mr. Carrabba served as president and chief executive officer of Cliffs from September 2006 through May 2007, and as Cliffs' president and chief operating officer from May 2005 to September 2006. He previously was president and chief operating officer of Diavik Diamond Mines, Inc., a subsidiary of Rio Tinto plc. from April 2003 to May 2005.

Other Directorships
KeyCorp
Newmont Mining Corporation
Capital University
Great Lakes Science Center

Senior Vice President of U.S. Gulf of Mexico, Africa and Frontier Region of Noble Energy Inc., an international oil and gas exploration and production company, since May 2013.

Ms. Cunningham served as Senior Vice President of Exploration and Business Innovation from May 2007 to May 2013, Senior Vice President of Exploration and Corporate Reserves from October 2005 to May 2007, and Senior Vice President of Exploration of Noble Energy Inc. from 2001 to 2005.

Former Managing Director and Chief Executive Officer of Portman Limited, an international iron ore mining company in Australia, from October 2002 through April 2005.

Other Directorships
(ASXListed) Sundance Resources Ltd.

President and Chief Executive Officer of The AES Corporation, one of the world's largest independent power producers with operations in 26 countries.

Dr. Gluski has been employed by AES for 10 years and was appointed to his current position in 2011. Prior to that, he served as executive vice president and chief operating officer, executive vice president and regional president, Latin America, and senior vice president of the Caribbean and Central America business. Earlier in his professional career, he worked with the International Monetary Fund and served as director general of the Ministry of Finance and senior economic policy advisor to the Minister of planning in Venezuela.

Other Directorships
The AES Corporation
AES Gener S.A.

Deputy General Counsel, U.S. Congressional Office of Compliance, since November 2007.

Ms. Green has served as both as a labor organizer and as an attorney representing organized labor.  She has worked in the legislative and Executive branches of the U.S. federal government. Ms. Green was originally proposed as a nominee for the Board of Directors by the United Steelworkers, or USW, pursuant to the terms of the 2004 labor agreement.

Former Senior Vice President (1998-2006), Chief Financial Officer (1994-2005) and Treasurer (2002-06) of Martin Marietta Materials, Inc., a producer of construction aggregates.  Ms. Henry has been a member of The Charles Stark Draper Laboratory, Inc., a nonprofit corporation, which engages in activities that contribute to the support and advancement of scientific research, technology and development.

Other Directorships
W.R. Grace & Co.

Former Chairman, President and Chief Executive Officer of Ferro Corporation, a supplier of technology-based performance materials for manufacturers.

Kirsch joined Ferro in 2004 as president and chief operating officer. He became president and chief executive officer in 2005 and added responsibilities as chairman in 2006. Previously, he served as president of Premix Inc. and Quantum Composites, president and a director for Ballard Generation Systems and vice president for Ballard Power Systems. He began his career with The Dow Chemical Company.

Chief Executive Officer of RKR Asset Management, a consulting organization, since June 2006.

Mr. Riederer served as Chief Executive Officer from January 1996, and President from January 1995 through February 2001, of Weirton Steel Corporation, a steel-producing company. He currently serves on the Board of Trustees of Franciscan University of Steubenville.

Other Directorships
First American Funds

Executive advisor of CCMP Capital Advisors LLC, a private equity firm, since 2012.

Mr. Sullivan served as President, Chief Executive Officer and Director of Bucyrus International Inc. from 2004 until 2011, and President of Bucyrus International Inc. from 2000 to 2004

Other Directorships
Aurora Health Care Inc
Generac Holdings Inc.
Milacron LLC
Northwestern Mutual Life Insurance Company