The Board of Directors of Trecora Resources announced that Patrick "Pat" D. Quarles has been appointed President and Chief Executive Officer. Mr. Quarles will be replacing Simon Upfill-Brown who has announced his plans to resign from the position to pursue other opportunities, effective, December 3, 2018. Mr. Quarles will continue to serve as a member of the Board.

Mr. Quarles joined Trecora's Board in September of this year, and he brings over 25 years of experience in the petrochemical industry. Most recently, Mr. Quarles served as Executive Vice President and President, Acetyl Chain and Global Supply Management at Celanese Corporation, a $6.1 billion global technology, specialty materials company. Prior to that, he spent 25 years with LyondellBasell Industries and predecessor companies.

Mr. Quarles holds a bachelor's degree in Mechanical Engineering from Clemson University and an MBA from Northwestern University, Kellogg School of Management.