About Chief Oil & Gas


Trevor D. Rees-Jones, Founder and CEO

After practicing oil and gas reorganization law, Mr. Rees-Jones entered the oil and gas business in 1984 as an independent involved in exploration and production. In 1994, he founded Chief Oil & Gas, which was an early operator in the development of the Barnett Shale field in North Texas and the Marcellus Shale in Pennsylvania and West Virginia. Chief continues as a leading privately-held, independent oil and natural gas exploration and production company, with substantial acreage position in the Marcellus, as well as holdings and activity in many other oil and gas basins throughout the United States. Mr. Rees-Jones is past president of both the Dallas Petroleum Club and the Dallas Hardhatters Committee (now the Dallas Wildcatters Committee). He is a member of the Board of Trustees at Texas Christian University. He received the Folsom Award for civic and community service in 2011. In 2013, he was awarded the Circle Ten Council Distinguished Eagle Scout Award. In 2017, Rees-Jones was the recipient of the Pitts Energy Leadership Award from the Maguire Energy Institute at the Cox School of Business - Southern Methodist University (SMU) in Dallas, Texas. Mr. Rees-Jones received his BA from Dartmouth College and his JD from SMU School of Law.

Steven C. Haworth, Senior Vice President and General Counsel

Mr. Haworth began consulting with Chief Oil & Gas in 2005 and has more than 40 years of oil and gas legal experience. Mr. Haworth joined Chief in his present position in 2012. Prior to joining Chief, he held legal positions at Sun Oil Company and Texas Oil & Gas Corp., and was VP - Acquisitions and EVP - General Counsel at NRM / Edisto Resources Corporation, followed by 19 years in private oil and gas law practice. He holds BA and JD degrees from Baylor University and is Board Certified in Oil, Gas and Mineral Law by the Texas Board of Legal Specialization.

John E. Hinton, Senior Vice President and Chief Financial Officer

Mr. Hinton joined Chief Oil & Gas in 2012. Prior to joining Chief, he served as VP of Finance and Investor Relations at Quicksilver Resources where he was responsible for planning, marketing, risk management and investor relations. Mr. Hinton also held various commercial and finance positions at Peoples Energy Production and Burlington Resources. He received his BBA in accounting and MBA in finance from SMU.

Andrew (Andy) E. Levine, Senior Vice President - Marketing

Mr. Levine joined Chief Oil & Gas in 2014. Prior to joining Chief, he served as VP of Transportation at Chesapeake Energy Marketing, Inc. managing negotiation of transportation capacity, market origination, customer relations and regulatory activities. Prior to joining Chesapeake in 2009, Mr. Levine was Director of Supply Development for Tennessee Gas Pipeline. He worked for Tennessee for 20 years and held commercial positions in Marketing, Supply and Business Development as well as in accounting. He graduated from Texas State University in 1988 with a BBA in Accounting and received a CPA certification in the state of Texas.

Glynne Mildren, Senior Vice President - Land

Mr. Mildren joined Chief Oil & Gas in 2007 after eleven years as the principal at Mildren Energy Services, a full-service land brokerage firm. He has been with Chief Oil & Gas or Rees-Jones Holdings since that time. Mr. Mildren also held various land positions for Enserch Exploration and was the Land Manager for Brigham Oil & Gas as well as Regency Exploration. Mr. Mildren received his BA in Economics from Dartmouth College.

Marcia Simpson, Senior Vice President - Engineering & Operations

Ms. Simpson joined Chief Oil & Gas in 2016 as Senior Vice President, Engineering & Operations. Prior to Chief, Ms. Simpson held the position of Vice President of Engineering with EXCO Resources. Throughout her 37-year career in the oil and natural gas industry, she has held positions in engineering, operations, reserves reporting, acquisitions and divestitures with Gulf Oil, Chevron, Mobil Oil, J-W Operating Company and EXCO Resources. She is a graduate of Penn State University where she received a Bachelor of Science in Petroleum and Natural Gas Engineering and is a registered Professional Engineer.