Board of Directors
Denise Castillo-Rhodes
Ms. Castillo-Rhodes is Chief Financial Officer of Texas Medical Center, where she oversees investments, accounting, finance, risk management and tax compliance. Ms. Castillo-Rhodes also serves as secretary of the board and chair of the Audit & Finance committee for Thermal Energy Corporation and as a director for the TMC Library and Texas Medical Center Hospital Laundry Co-Op, all of which are member institutions of Texas Medical Center. Ms. Castillo-Rhodes has served Texas Medical Center in this capacity since 2004. Prior to becoming Chief Financial Officer, from 2002-2004, Ms. Castillo-Rhodes served as Vice President and Controller for Texas Medical Center. Prior to joining Texas Medical Center, Ms. Castillo-Rhodes served as Controller for Nabisco’s Manufacturing Facility in Houston. Ms. Castillo-Rhodes is a Trustee for the City of Houston’s Municipal Employee Pension System and in 2022 was appointed by Governor Abbott to serve on the Governor's Commission for Women. Ms. Castillo-Rhodes holds a Bachelor of Business Administration from the University of Texas at El Paso and a Master of Business Administration from the University of St. Thomas. She is a Certified Public Accountant and is a member of the Texas Society of Certified Public Accountants and American Institute of Certified Public Accountants.
Lawrence R. Dickerson
Mr. Dickerson retired in March 2014 as President and Chief Executive Officer of Diamond Offshore Drilling, Inc., an offshore drilling company. During his 34-year career at Diamond, Mr. Dickerson held a number of senior positions, including Chief Operating Officer and Chief Financial Officer. He holds a B.B.A. from the University of Texas.
Lloyd A. Hajdik
Mr. Hajdik is the Chief Executive Officer and President of Oil States and a member of the Company’s Board of Directors since May 2026. He served as our Executive Vice President, Chief Financial Officer and Treasurer from May 2016 to May 2026 and as our Senior Vice President, Chief Financial Officer and Treasurer from December 2013 to May 2016. Prior to joining the Company, he served as the Chief Financial Officer of GR Energy Services, LLC, a privately-held oilfield services entity, from September to November 2013. From December 2003 to April 2013, Mr. Hajdik served in various financial management roles with Helix Energy Solutions Group, Inc. (“Helix”), most recently as Senior Vice President – Finance and Chief Accounting Officer. Prior to joining Helix, Mr. Hajdik served in a variety of accounting and finance related roles of increasing responsibility with Houston-based companies, including NL Industries, Inc., Compaq Computer Corporation (now Hewlett Packard), Halliburton Company, Cliffs Drilling Company and Shell Oil Company. Mr. Hajdik was with Ernst & Young LLP in the audit practice from 1989 to 1995. He graduated Cum Laude with a B.B.A. from Texas State University. Mr. Hajdik is a Board Member for the Energy Workforce & Technology Council, a Certified Public Accountant and a member of Financial Executives International.
Darrell E. Hollek
Mr. Hollek served as Executive Vice President, Operations of Anadarko Petroleum Corporation (“Anadarko”), an independent oil and natural gas exploration and production company with operations onshore and offshore the United States, and internationally in Africa and South America until he retired in 2017. His responsibilities included U.S. onshore exploration, production and midstream activities along with Gulf of Mexico and international operations. During his 38-year career at Anadarko, Mr. Hollek held a number of senior leadership positions, including Executive Vice President, U.S. Onshore Exploration and Production, Senior Vice President, Deepwater Americas Operations and Vice President of Gulf of Mexico and Worldwide Deepwater Operations. Mr. Hollek holds a Bachelor of Science degree in Mechanical Engineering from Texas A&M University.
Robert L. Potter
Mr. Potter served as President of FMC Technologies, Inc. (“FMC”), a global provider of technology solutions for the energy industry, from August 2012 until November 2013 when he retired. Mr. Potter joined FMC in 1973 after his graduation from Rice University with a degree in Commerce. He served in a number of sales management roles in North America and overseas (Middle East, Europe, and Africa). Subsequently, he held numerous operations management roles responsible for multiple manufacturing facilities throughout North and South America. In 2001, Mr. Potter was appointed as Vice President of Energy Processing and a corporate officer following FMC Technologies split from FMC Corporation. In this role, Mr. Potter was responsible for multiple global businesses focused on downstream energy applications. In 2007, he was appointed Senior Vice President of Energy Processing and Global Surface Wellhead and then in 2010 to Executive Vice President of Energy Systems where he was responsible for FMC’s upstream and downstream portfolio. Mr. Potter is a former chair of the board for the Petroleum Equipment & Services Association and a former member of the board of directors of the National Ocean Industries Association. He is a current member of the Board of Advisors for the Jones Graduate School of Business at Rice University.
Hallie A. Vanderhider
Ms. Vanderhider served as Managing Director of SFC Energy Partners, a private equity firm, from January 2016 to June 2022, when she retired. Previously, Ms. Vanderhider served as Managing Partner of Catalyst Partners LLC, a merchant banking firm providing financial advisory and capital services to the energy and technology sectors, from August 2013 to May 2016. She served for ten years as President, Chief Operating Officer and member of the board of Black Stone Minerals Company, L.P., where prior to becoming President in 2007, she served as Executive Vice President and Chief Financial Officer. Prior to Black Stone, Ms. Vanderhider served as Chief Financial Officer for EnCap Investments from 1994 to 2003. Before joining EnCap, Ms. Vanderhider served as Chief Accounting Officer of Damson Oil Corp. She received a B.B.A. in Accounting from the University of Texas at Austin and is a Certified Public Accountant.
E. Joseph Wright
Since February of 2021, Mr. Wright has served as an independent partner of Geneses Capital Management, LLC. In January 2019, Mr. Wright retired from Concho Resources Inc. (“Concho”), an independent exploration and production company engaged in the acquisition, development and exploration of oil and natural gas properties, where he most recently served as Executive Vice President and Chief Operating Officer. He served as a director of Concho from May 2017 to January 2021. Since joining Concho from its formation in 2004, Mr. Wright held a variety of leadership positions, including Senior Vice President and Chief Operating Officer and Vice President of Engineering and Operations. As Executive Vice President and Chief Operating Officer, he oversaw Concho’s drilling and completion programs, as well as its government, regulatory affairs and human resources functions. Prior to Concho, Mr. Wright was Vice President of Operations and Engineering of Concho Oil & Gas Corp. from its formation in 2001 until its sale in 2004. From 1997 to 2001, he was Vice President of Operations of Concho Resources Inc., a predecessor company to Concho Oil & Gas Corp. Mr. Wright has also worked in several operations, engineering and capital markets positions at Mewbourne Oil Company. He holds a Bachelor of Science degree in Petroleum Engineering from Texas A&M University.
