Ms. Nelson has served as a director of Patterson-UTI since September 2023. Ms. Nelson served as a member of NexTier’s board of directors from October 2019 to September 2023. She is also the president of Greenridge Advisors, LLC, which she founded in 2007 as an energy services and equipment consulting firm focused on the development, execution, and financing of corporate and product line strategies. Ms. Nelson advises her clients on strategy development, capital allocation, acquisition evaluation and infrastructure development. Her clients span a broad range of oilfield service, product and geographic markets. Ms. Nelson has been a member of APA Corporation’s board of directors since 2014, and she is a member of both its audit committee and corporate responsibility, governance, and nominating committee. She also joined the Helix Energy Solutions Group, Inc. board of directors and its audit committee in July of 2019, and in May of 2020 began serving as the chair of the audit committee. Ms. Nelson also serves on the board of directors of certain private companies, including Enercorp Sand Solutions, Merichem Company and Sunland Construction. Ms. Nelson began her career at Amoco Production Company in a variety of engineering, project management and planning roles. From 2000 to 2007, Ms. Nelson served as a vice president of SCF Partners, an oilfield service and equipment-focused private equity firm, where she concentrated on investment strategy, investment execution and portfolio company management. Ms. Nelson has devoted her career to serving companies in the oil and gas industry.