Nucor Corp.

Mr. Lisenby has been Chief Financial Officer, Treasurer and Executive Vice President since January 2000. He previously served as a Vice President and Corporate Controller of Nucor Corporation from 1991 to 1999. Mr. Lisenby began his career with Nucor as Corporate Controller in 1985.

Mr. Parrish has been an Executive Vice President of Nucor since November 1998 and was a Vice President from 1990 to 1998. He was General Manager of Nucor Steel, Hickman, Arkansas from 1995 to 1998; General Manager of Nucor Steel, Jewett, Texas from 1991 to 1995; General Manager of Vulcraft, Brigham City, Utah from 1989 to 1991; Production Manager of Vulcraft, Fort Payne, Alabama from 1986 to 1989; Engineering Manager of Vulcraft, Brigham City, Utah from 1981 to 1986; and Engineer at Vulcraft, St. Joe, Indiana from 1975 to 1981.

Mr. Lott has been an Executive Vice President of Nucor since September 1999 and was a Vice President from 1988 to 1999. He was General Manager of Vulcraft, Florence, South Carolina, from 1993 to 1999; General Manager of Vulcraft, Grapeland, Texas from 1987 to 1993; Sales Manager of Vulcraft, St. Joe, Indiana from January 1987 to May 1987 and Engineering Manager there from 1982 to 1986. Mr. Lott began his career with Nucor as a Design Engineer at Vulcraft, Florence, South Carolina in 1975.

Mr. Ferriola has been Chief Operating Officer of Steelmaking Operations since September 2007. He previously served as an Executive Vice President of Nucor from 2002 to 2007 and was a Vice President from 1996 to 2001. He was General Manager of Nucor Steel, Crawfordsville, Indiana from 1998 to 2001; General Manager of Nucor Steel, Norfolk, Nebraska from 1995 to 1998; General Manager of Vulcraft, Grapeland, Texas in 1995; and Manager of Maintenance and Engineering at Nucor Steel, Jewett, Texas from 1992 to 1995.

Mr. Rutkowski has been an Executive Vice President of Nucor since November 1998 and was a Vice President from 1993 to 1998. He was General Manager of Nucor Steel, Hertford County, North Carolina from August 1998 to November 1998; General Manager of Nucor Steel, Darlington, South Carolina from 1992 to 1998; Manager of Melting and Casting of Nucor Steel, Plymouth, Utah from 1991 to 1992; and Manager of Nucor Cold Finish, Norfolk, Nebraska from 1989 to 1991.

Mr. Hall has been an Executive Vice President of Nucor since September 2007 and was Vice President and General Manager of Nucor Steel Berkeley County, South Carolina from 2000 to 2007; Vice President and General Manager of Nucor Steel Darlington, South Carolina from 1998 to 2000; Vice President of Vulcraft, Brigham City, Utah from 1994 to 1998 and General Manager there from 1993 to 1994; General Manager Vulcraft, Grapeland, Texas from June 1993 to September 1993; Sales Manager Vulcraft, Brigham City, Utah from 1988 to 1993; and Inside Sales at Nucor Steel Plymouth, Utah from 1981 to 1988.

Mr. Stratman has been an Executive Vice President of Nucor since September 2007 and was Vice President and General Manager of Nucor Yamato Steel from 1999 to 2007. He was Vice President of Nucor Steel, Norfolk, Nebraska in 1999 and General Manager there from 1998 to 1999; Controller of Nucor Yamato Steel from 1991 to 1998; and Controller of Nucor Building Systems Waterloo, Indiana from 1989 to 1991.

Peter C. Browning is non-executive chairman of Nucor Corporation, a steel products manufacturing company in Charlotte. Previously he was dean of the McColl Graduate School of Business, Queens University of Charlotte.

Bernard Kasriel (1946) was appointed to the Lafarge Board of Directors in 1989. He was Chief Executive Officer of Lafarge from 2003 to 2005. He began his career in 1970 at the Institut du Développement Industriel. He then served as Chief Executive Officer of Braud from 1972 to 1974 and as Senior Executive Vice-President of the Société Phocéenne de Métallurgie from 1975 to 1977. He joined Lafarge in 1977 and held various executive positions within the Group, notably as Senior Executive Vice-President from 1982 to 1989, Chief Operating Officer from 1989 to 1994, and Vice-Chairman Chief Operating Officer from 1995 to 2003. From 1987 to 1989, he served as President and Chief Operating Officer of National Gypsum in Dallas, Texas. He holds various executive positions in the subsidiaries of Lafarge. He was director of Sonocco Products Company until 2007. His term of office expires at the General Meeting approving financial statements for the financial year ended 2009. He is a director of L'Oréal (France), Arkema and Nucor (United-States). He has been a partner and member of the Board of Directors of L.B.O. France since September 2006.

Christopher J. Kearney, 54, is Chairman, President and Chief Executive Officer of SPX. He was named President and Chief Executive Officer in December 2004, and added the title of Chairman in May 2007. He joined the company in February 1997 as Vice President, Secretary and General Counsel and an officer of the company. Prior to joining SPX he was Senior Vice President and General Counsel of Grimes Aerospace Company, a leading manufacturer of aircraft lighting equipment, engine system components and electronic systems. His business experience also includes positions at Borg-Warner Chemicals as Senior Attorney and Senior Counsel at General Electric's global materials business. Mr. Kearney holds an undergraduate degree from the University of Notre Dame and a law degree from DePaul University Law School. Mr. Kearney is a Member of the Advisory Council for University Libraries, University of Notre Dame. Mr. Kearney is a director of Nucor Corporation. Mr. Kearney has been a director of SPX since 2004.

Elected to United's board of directors in 2002, John H. Walker is the chief executive officer of Global Brass and Copper, Inc. the leading manufacturer and distributor of copper and copper-alloy sheet, strip, plate, foil, rod and fabricated components in North America. Prior to joining Global Brass and Copper, Inc. Mr. Walker was the president and chief executive officer of The Boler Company (the holding company of Hendrickson International, a commercial heavy-duty vehicle supplier) from 2003 to 2006 and president and chief executive officer of Weirton Steel Corp from 2000 to 2003. Earlier in his career, Walker was president of Kaiser Aluminum's flat rolled business and an associate with McKinsey & Company. Walker also serves on the boards of Delphi Corporation, Nucor Corporation and the American Red Cross of Greater Chicago. He received his bachelor's degree in engineering from Virginia Polytechnic Institute and a master's degree with distinction in business administration from Carnegie Mellon University.