On March 25, 2019, the Board of Directors of TETRA Technologies, Inc. appointed Richard D. O’Brien as Vice President – Finance & Global Controller and as the principal accounting officer of the Company, effective immediately. Mr. O’Brien served in several senior finance positions with increasing responsibilities with BHP Petroleum from October 2002 until he joined the company. He served as Head of Separation of BHP’s shale business from June 2018 until March 2019 and prior to that as Head of Finance, Shale, from July 2014 until May 2018, and as Operations Accounting Controller, from December 2012 until July 2014.