Our Attorneys
At Trimble Law Group, our expertise in oil and gas law meets unparalleled dedication to our clients. With a focus on navigating the intricate landscape of the oil and gas industry, our firm is committed to providing exceptional legal counsel to a diverse range of clients, from large, independent oil and gas companies to individual mineral owners.
Paul Trimble
Paul Trimble is the Managing Member of Trimble Law Group, PLLC, which he founded in June 2020. He is licensed to practice law in the state of Oklahoma and is admitted to practice before the Tenth Circuit Court of Appeals and the U.S. District Courts for the Western, Eastern, and Northern Districts of Oklahoma.
With over 30 years of legal experience, Paul’s practice focuses primarily on upstream oil and gas matters. In addition to his oil and gas litigation practice, he has extensive experience supporting oil and gas companies with their day-to-day legal needs, including drafting and negotiating a wide range of industry agreements such as purchase and sale agreements, oil and gas leases, assignments, farmout agreements, joint operating agreements, surface use agreements, and master service agreements. Prior to founding his own firm, Paul spent 24 years at large regional firms and nearly six years as in-house counsel at a large oil and gas company, managing its legal operations across the Mid-Continent area.
Paul has also successfully mediated a number of oil and gas related cases and served as an expert witness in the areas of oil and gas transactions and disputes regarding title matters.
In addition to his legal practice, Paul is dedicated to legal education. Since 2019, he has served as an adjunct professor at the University of Oklahoma College of Law, where he currently teaches Oil and Gas Practice. He previously taught Oil and Gas Law at OU Law from 2019 to 2022, at Oklahoma City University School of Law from 2016 to 2019, and taught both Oil and Gas Law and Energy Law at the University of Oklahoma’s Price College of Business from 2003 to 2014. Paul was named by the University of Oklahoma College of Law as the 2025 recipient of the Eugene Kuntz Award, which recognizes those who have made significant contributions to oil, gas and natural resources law.
Gary Thompson
Gary Thompson is a graduate of the University of Oklahoma College of Law where he was a member of the Oklahoma Law Review. He also has an undergraduate degree from the University of Oklahoma in Finance. Gary is licensed to practice in Oklahoma, Texas and Arkansas. He is a member of the Oklahoma County Bar Association, the Oklahoma City Association of Professional Landmen and the Mineral Lawyers Society of Oklahoma City.
Gary’s practice is oil and gas centered. In addition to advising clients on a variety of oil and gas issues, including document review and interpretation, Gary has authored hundreds of Drilling, Supplemental, Division Order and/or Acquisition Title Opinions. He has also managed and completed various acquisition and due diligence projects.
Gary has served as a consultant or an expert witness in numerous complex matters involving title issues. As an expert witness, he has testified in both district courts and in federal courts in Oklahoma.
Robert P. Costello
Robert P. Costello is a seasoned legal and energy industry professional with over four decades of experience in the oil and gas industry as a member of the Trimble Law Group. He earned his Bachelor of Business in Petroleum Land management from the University of Oklahoma and became a member of the Oklahoma Bar in 1988. Bob began his legal career focused on oil and gas litigation with a broad range of subject matters ranging from operational disputes, various contract disputes, oil and gas lease cancellation cases, and oil field accidents. He then transitioned to an inhouse position for a major midcontinent industry leader managing the legal affairs for the northern midcontinent area including Oklahoma, Kansas, Arkansas and the panhandle of Texas. He helped start up a private equity exploration and production company with assets in Oklahoma, Kansas and Texas as the General Counsel, Vice President of Land and Corporate Secretary. He was directly involved in and oversaw well over $2 billion in asset and corporate transactions and managed the firm’s land department.
Since 2022, Costello has returned to private practice as an attorney with the Trimble Law Group, handling litigation, asset transactions and providing General Counsel-type services for his clients in the energy sector.
Costello has also contributed to the industry through leadership roles, including serving on the Executive Committee and Board of Directors of the Petroleum Alliance of Oklahoma (2018-2021). He has shared his expertise as an Adjunct Professor of Law at Oklahoma City University School of Law, teaching Oil & Gas Contracts.
Jennifer Volino
Jennifer Volino graduated from the University of Oklahoma College of Law in 2011 and is a member of the Oklahoma Bar Association. Since the start of her legal career, she has focused her practice on oil, gas, and energy law, with a particular emphasis on title examination.
She regularly assists clients with a variety of curative matters, including probates, quiet title actions, and the preparation of curative instruments. Jennifer has extensive experience working with royalty owners and division order departments to resolve title defects and facilitate the release of suspended revenues.
Jennifer believes efficiency, precision, and dedication are essential qualities for a successful legal practice, and she works diligently to provide thorough and reliable work that supports her clients’ success.
Outside the office, she enjoys spending time with her husband, Jordan, and their dog, Knox, as well as traveling internationally and staying connected with friends and family.
Patrick S. McBride
Patrick S. McBride is an energy attorney focusing on upstream oil and gas matters including oil and gas agreements, acquisitions and divestitures, exploration, development and joint operating agreements, farmouts, leases, assignments, easements, and mineral title.
Patrick brings more than 20 years of executive and operational experience in the upstream oil and gas industry to his legal practice. Before entering the law, Patrick served as Vice President of Geosciences for a private equity–backed exploration and production company.
Drawing on his background as a geoscientist and executive, Patrick provides clients with practical, business-oriented counsel grounded in firsthand experience with capital allocation, reserve-based lending, drilling programs, and operational risk. His perspective allows him to understand not only the legal framework of a transaction, but also the technical and financial realities driving it.
Patrick also advises individuals and families on a broad range of estate planning matters, including the design and implementation of wills, revocable trusts, durable powers of attorney, and advance health care directives. He works closely with clients to develop practical, tailored plans that protect assets and provide for loved ones. Recognizing that these decisions often involve deeply personal and sometimes difficult considerations, Patrick approaches estate planning with pastoral care, offering a steady, thoughtful perspective that helps clients navigate the process with confidence and peace of mind.
Patrick earned his J.D., with distinction, from the University of Oklahoma College of Law, where he received the American Jurisprudence Award in Contracts and Corporate Drafting. He also holds a Bachelor of Science and a Master of Science in Geology from West Virginia University as well as a Master of Arts in Theology from the Southern Baptist Theological Seminary. He is licensed to practice in Oklahoma.
Practice Areas
Transactions & Negotiations
Title & Ownership
Litigation & Dispute Resolution
Compliance
Corporate Counsel
Estate Planning
Probates
Non-Profit
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