Shareholder/Director Archives

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Bradley W. Welsh

Brad Welsh is a shareholder in the firm’s Tulsa office and a member of the Energy, Environment & Natural Resources, Litigation & Trial, and Administrative & Regulatory Practice Groups. With more than 20 years of energy law experience, Brad primarily…

Craig M. Regens

Craig Regens is a shareholder in the firm’s Oklahoma City office. He concentrates his practice in the areas of bankruptcy, restructuring, and creditors’ rights, energy and environmental litigation, oil and gas transactions, and commercial litigation. Craig frequently represents oil and…

Dale Cottingham

Dale Cottingham is a shareholder in the firm’s Oklahoma City office with more than 40 years of experience practicing in the areas energy and environmental law. He has extensive experience representing clients across a broad spectrum of oil and gas…

Lewis LeNaire

Lewis LeNaire is a shareholder in the firm’s Oklahoma City office. As a member of the Energy, Environment & Natural Resources Practice Group, Lewis represents energy industry clients in complex business litigation in state and federal courts. His comprehensive energy…

J. Christopher Davis

Chris Davis is a shareholder and director in the firm’s Tulsa office. He represents clients as a member of the firm’s Alternative Dispute Resolution, Insurance, Intellectual Property, Litigation & Trial, and Product Liability Practice Groups. With more than 27 years…

Madalene A.B. Witterholt

With more than 35 years of experience, Madalene Witterholt assists clients in the full spectrum of employment law issues. Starting with employee hiring and I-9 compliance, employer policy development and day-to-day advice she provides employee training as well as the…

L. Mark Walker

L. Mark Walker, a director in Crowe & Dunlevy’s Oklahoma City office, focuses his practice in the areas of energy, natural resources and environmental law. His practice includes litigation in both federal and state courts, as well as practicing before…

Evan G.E. Vincent

Evan Vincent specializes in the litigation process. He knows how to use the procedures and rules that govern civil lawsuits to his clients’ advantage, and he has the skills and experience to take a case to trial in front of…

John M. Thompson

John Thompson serves as a shareholder and director for Crowe & Dunlevy in the firm’s Oklahoma City office, and chairs the firm’s Litigation & Trial Practice Group. John has concentrated his practice in the litigation of complex business matters and…

David M. Sullivan

David Sullivan is a registered patent attorney and chair of the firm’s Intellectual Property and Technology group. David’s practice is primarily directed at obtaining and enforcing patent and trademark rights for his clients, who range from Fortune 500 companies to…