David N. Weidman is chairman and chief executive officer of Celanese Corporation, a Fortune 500 global chemical company based in Dallas, Texas. Celanese is a technology leader in the production of specialty materials and chemical products which are used in most major industrial and consumer applications. Weidman has served as president and chief executive officer since December 2004 and was appointed chairman by the board of directors in February 2007. Weidman led Celanese’s transformation from a German-based company traded on the Frankfurt Stock Exchange through a private equity transaction to a fully independent company traded on the New York Stock Exchange. Under Weidman’s leadership Celanese has accelerated its globalization and innovation, moving rapidly into regions of high growth with expanded product offerings that leverage advanced proprietary technologies. Today Celanese sets the highest global standards in operations and safety. The company was recognized by the American Chemistry Council with the 2009 Responsible Care Sustained Excellence Award and the 2010 Responsible Care Initiative Award. As a result, Celanese is now a recognized leader in globalization, innovation, sustainability and safety.Before joining Celanese in 2000, Weidman held executive responsibilities with several companies including Honeywell and Allied Signal. Weidman is past chairman of the Society for Chemical Industry and of the American Chemistry Council. He is a member of the board of The Conservation Fund and serves on several advisory councils at the University of Michigan and Brigham Young University. He received his bachelor’s of science degree in Chemical Engineering from Brigham Young University and his master’s degree in Business Administration from the University of Michigan.

James E. Barlett has been a member of our Board of Directors since December 2004. He has been Vice Chairman of TeleTech Holdings, Inc. since October 2001. Mr. Barlett was elected to TeleTech Holdings, Inc.’s Board of Directors in February 2000. Mr. Barlett also serves on the Board of Directors of Covansys. He previously served as the Chairman, President and Chief Executive Officer of Galileo International, Inc. Prior to joining Galileo, Mr. Barlett served as Executive Vice President for MasterCard International Corporation and was Executive Vice President for NBD Bancorp. Mr. Barlett serves as a Director of TeleTech Holdings, Inc. and Korn/Ferry International, and is also a member of Korn/Ferry’s Audit Committee.

David F. Hoffmeister has served on our Board of Directors since May 2006 and Chairman of the Audit Committee since August 2007. Since October 2004, Mr. Hoffmeister has served as Chief Financial Officer, Senior Vice President, Finance at Invitrogen Corporation, a NASDAQ listed company which develops, manufactures and markets research tools for life sciences research, drug discovery, diagnostics and commercial manufacture of biological products. Before joining Invitrogen, Mr. Hoffmeister spent 20 years with McKinsey &Company as a senior partner serving clients in the healthcare, private equity and chemical industries on issues of strategy and organization. From 1998 to 2003, Mr. Hoffmeister was the leader of McKinsey’s North American chemical practice.

Martin G. McGuinn has been a member of our Board of Directors and the Audit Committee since August 2006. He currently serves as a Director of The Chubb Corporation and is a member of the Audit Committee as well as the Organization and Compensation Committee. He also serves as a member of CapGen Financial Advisors, LLC Advisory Board. He was Chairman and Chief Executive Officer of Mellon Financial Corporation until February 2006, where he spent 25 years in a number of positions. Mr. McGuinn served as Chairman of the Financial Services Roundtable and as the 2005 President of the Federal Reserve Board’s Advisory Council. Mr. McGuinn also serves on several nonprofit boards including the Carnegie Museums of Pittsburgh and the University of Pittsburgh Medical Center.

Paul H. O’Neill has been a member of our Board of Directors since December 2004. Mr. O’Neill has been a Special Advisor at The Blackstone Group L.P. since March 2003. Prior to that, he served as U.S. Secretary of the Treasury during 2001 and 2002 and was Chief Executive Officer of Alcoa, Inc. from 1987 to 1999 and Chairman of the Board from 1987 to 2000. He currently also serves as a Director on the Boards of TRW Automotive Holdings Corp., Nalco Holding Company.

Mark C. Rohr has been a member of our Board of Directors since April 2007. He is chairman of the board of Albemarle Corporation. Rohr served as Albemarle's President and Chief Operating Officer from January 2000 through September 2002. Previously, Rohr served as Executive Vice President—Operations of Albemarle. Before joining Albemarle, Rohr served as Senior Vice President, Specialty Chemicals of Occidental Chemical Corporation.

Daniel S. Sanders has been a member of our Board of Directors since December 2004. He was President of ExxonMobil Chemical Company and Vice President of ExxonMobil Corporation from December 1999 until his retirement in August 2004. Prior to the merger of Exxon and Mobil, Mr. Sanders served as President of Exxon Chemical Company beginning in January 1999 and as its Executive Vice President beginning in 1998. Mr. Sanders is a member of the Council of Overseers of the Jesse H. Jones Graduate School of Management at Rice University, the Advisory Board of Furman University and the Board of the Greenville Symphony. He is the past Chairman of the Board of the American Chemistry Council and past Chairman of the Society of Chemical Industry (American Section). He currently serves as a Director and member of the Compensation and Governance Committee of Milliken and Co.; a Director and Chairman of the Compensation and Governance Committee of Arch Chemical and a Director, member of the Compensation Committee and Chairman of the Safety, Health and Environmental Committee of Nalco Holding Company. Mr. Sanders is the recipient of the 2005 Chemical Industry Medal awarded by the Society of Chemical Industry (American Section).

Farah M. Walters has been a member of our Board of Directors and Compensation Committee since May 2007. She serves as President and Chief Executive Officer of QualHealth, LLC, a healthcare consulting firm that designs healthcare delivery models. She also serves as a Director and member of the Compensation and Governance Committee and of the Financial Policy Committee for PolyOne Corporation. From 1992 until her retirement in June 2002, Ms. Walters was the President and Chief Executive Officer of University Hospitals Health System and University Hospitals of Cleveland.

John K. Wulff has been a member of our Board of Directors since August 2006. He has been the Non-Executive Chairman of the Board of Hercules Incorporated since July 2003. Prior to that, he served as a member of the Financial Accounting Standards Board from July 2001 until June 2003. Mr. Wulff was previously Chief Financial Officer of Union Carbide Corporation from 1996 to 2001. During his fourteen years at Union Carbide, he also served as Vice President and Principal Accounting Officer from January 1989 to December 1995, and Controller from July 1987 to January 1989. Mr. Wulff was also a partner of KPMG and predecessor firms from 1977 to 1987. He currently serves as Director on the boards of Moody’s Corporation (where he is Chairman of the Audit Committee), Sunoco Incorporated, Fannie Mae (where he is Chairman of the Nominating and Corporate Governance Committee) and Hercules Incorporated.