Mark C. Rohr is chief executive officer and chairman of Celanese, a Fortune 500 global technology and specialty materials company based in Dallas, Texas. Celanese is a leader in the development and production of materials used in most major industrial and consumer applications. Rohr was named Chairman and CEO effective April 2, 2012 after being a member of the company’s Board of Directors since 2007. While on the Board, Rohr served on the Nominating and Corporate Governance Committee and on the Environmental, Health and Safety committee. Prior to Celanese, Rohr spent 11 years at Albemarle Corporation, most recently as executive chairman and director, and previously in various executive positions including chairman and CEO until 2011. Under his leadership, the company finished 2011 with its highest annual revenue and earnings. Rohr also facilitated the company’s expansion with acquisitions and new sites in Europe, Asia and South America.Rohr also fostered a deeper commitment to corporate social responsibility through increased employee engagement. In 2010 and again in 2011 the company was named to Corporate Responsibility Magazine’s 100 Best Corporate Citizen’s list, which is acknowledged as the world’s most respected corporate responsibility ranking and one of the top three business rankings in the United States. Earlier in his career, Rohr held executive leadership roles with companies including Occidental Chemical Corporation and Dow Chemical. He currently serves on the board of directors of Ashland Inc. and the American Chemistry Council. Rohr earned his bachelor’s of science degree in chemistry and chemical engineering from Mississippi State University and serves on the advisory board for the University’s College of Arts and Sciences.

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.

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.

Jay V. Ihlenfeld has been a member of our board of directors since February 2012. Since 2006, he has served as the Senior Vice President, Asia Pacific, for 3M Company, a leader in technology and innovation. Mr. Ihlenfeld previously served as 3M Company’s Senior Vice President, Research and Development from 2002 to 2006. A 33-year veteran of 3M Company, Mr. Ihlenfeld has also held various leadership and technology positions, including Vice President of its Performance Materials business and Executive Vice President of its Sumitomo/3M business in Japan.