Mr. Armstrong has been a Director of the Company since March 2005. Mr. Armstrong served as a Director of Varco from May 20, 2004 until its merger with the Company on March 11, 2005. In October 2018, Mr. Armstrong retired from his position as Chief Executive Officer of Plains All American GP LLC, the general partner and controlling entity of Plains All American Pipeline, L.P., a publicly traded master limited partnership engaged in the business of marketing, gathering, transporting, terminalling and storing crude oil. Mr. Armstrong had been serving as the Chairman of the Board and Chief Executive Officer of Plains All American GP LLC since 1998 and is expected to continue serving as the Non-Executive Chairman of the Board of Directors of Plains All American GP LLC through 2019. Mr. Armstrong also serves as a director of the Independent Petroleum Association of America Southwest Texas Region and is a member of the National Petroleum Council.