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The Best Lawyers in America® 2027 Recognizes 88 Crowe Dunlevy Attorneys; 11 Honored as Lawyer of the Year
Aug 20, 2026|
6 minute read
How do I provide energy companies with litigation services and other comprehensive counsel?
Energy and environmental matters often involve a blend of overlapping business, regulatory and litigation components, and I enjoy guiding clients through the resulting challenges. Over the course of my career, I’ve handled just about every type of issue that can arise in the energy and environmental space, allowing me to step into matters and assist my clients effectively at virtually any stage.
Representing energy clients across litigation, regulatory proceedings and day-to-day operational concerns
Mark’s practice centers on the energy industry, where he represents clients ranging from publicly traded integrated energy companies and upstream producers to midstream operators, downstream refiners, oilfield service companies, privately held companies and mom-and-pop operators. A litigator, he also handles pollution matters before the Oklahoma Corporation Commission, and provides ongoing business counsel to clients. This combination allows him to remain involved with clients as their legal needs evolve, rather than only when disputes arise.
Litigating royalty and other complex oil and gas disputes
While Mark handles disputes of all types, he has an extensive background in high-stakes royalty litigation, including class actions involving alleged underpayment and late payment of oil and gas royalties. These cases often turn on varying lease language, gas quality and marketability issues, and the necessity and reasonableness of post-production activities, requiring a detailed understanding of both the legal and operational aspects of oil and gas production. Mark also offers a valuable regional perspective, having tried matters in Oklahoma, Texas, Louisiana, Kansas and Arkansas.
Guiding clients through Oklahoma’s increasingly important water law issues
As demands for Oklahoma’s water resources continue to grow, so have disputes over water rights and permitting. Few Oklahoma attorneys can match Mark’s level of experience representing clients before the Oklahoma Water Resources Board in contested water proceedings involving both groundwater and stream water. When permit applications are challenged, he leads clients through evidentiary hearings addressing competing water uses, regulatory requirements and technical issues.
Demonstrating thought leadership in environmental and natural resources law
Mark is a Fellow of the American College of Environmental Lawyers, an invitation-only organization with a very small number of members in Oklahoma. He is also a frequent author and speaker on energy, environmental and natural resources issues, contributing to legal publications and presenting at conferences sponsored by organizations including the American Bar Association and Oklahoma Bar Association.