Mr. Drummond has served as a director of Patterson-UTI since September 2023. Mr. Drummond served as a member of NexTier’s board of directors from August 2018 to September 2023. He joined NexTier in August 2018 as Chief Executive Officer and was elected as President in October 2019. Prior to joining NexTier, Mr. Drummond served as the President & Chief Executive Officer of Key Energy Services, Inc. and served for more than 30 years at Schlumberger Limited in various executive positions. Mr. Drummond has been a Supervisory Director at Expro Group Holdings N.V. since May 2017. He has previously served on the board of directors of the National Ocean Industries Association, the Houston Offshore Energy Center, the Greater Houston Partnership, the API Upstream Committee, and as an Advisory Board Member of the University of Houston Global Energy Management Institute. Mr. Drummond attained his B.S. in Mineral/Petroleum Engineering from the University of Alabama.