Karen Twitchell — Independent Director at Kraton Performance Polymers

Ms. Karen A. Twitchell served as the Chief Financial Officer and Executive Vice President at Landmark Aviation, L.L.C. from 2010 to 2013. Ms. Twitchell was responsible for all financial and strategic planning functions. Ms. Twitchell has over 35 years of experience in financial management, including financings, mergers and acquisitions, investor relations, accounting and enterprise risk management. Ms. Twitchell served as Vice President, Treasurer, Principal Financial Officer and Principal Accounting Officer of Lyondell Petrochemical G.p. Inc. and Millennium Petrochemicals Inc. She served as Vice President and Treasurer at LyondellBasell Industries N.V. and Lyondell Chemical Company from 2001 to 2009. She served as Vice President and Treasurer of Kaiser Aluminum & Chemical Corporation of Kaiser Aluminum Corporation from July 31, 1998 to 2000. She served as Vice President, Treasurer, Principal Financial Officer and Principal Accounting Officer of Equistar Chemicals, LP. Ms. Twitchell served as Vice President and Treasurer at KAV since September 1, 1998. She served as a Vice President of Southdown, Inc., from April 1994 to 1996 and Treasurer from 1989 to 1996. She was an Investment Banker of Credit Suisse First Boston in its Corporate Finance department from 1978 to 1980 and from 1982 to 1988. She has been an Independent Director of Trecora Resources since May 20, 2015. She has been an Independent Director at Kraton Corporation since December 3, 2009. She has been a Director of KMG Chemicals Inc., since February 25, 2010 and Kraton Polymers LLC since December 3, 2009. Ms. Twitchell holds a B.A. in Economics from Wellesley College and an MBA from Harvard University.