Appellate / Litigation
Crowe Dunlevy Helps Secure U.S. Supreme Court Victory and New Trial in Richard Glossip Case
Sep 25, 2026
How do I help clients on their tax issues and disputes, white collar matters, and litigation?
Clients appreciate that I provide both the analytical mindset of a certified public accountant and the advocacy of an experienced trial lawyer. Whether resolving a civil tax controversy, defending a criminal tax investigation, or counseling an organization on compliance, I focus first on understanding the facts and then on developing a strategy that protects my clients’ interests and positions them for the best possible outcome. Every matter presents its own nuances, and I believe careful preparation, direct communication and practical guidance make all the difference.
Guiding clients through tax controversies and investigations
Jeff Trevillion represents businesses, nonprofit organizations and individuals in complex federal and state tax disputes, white collar matters and litigation. His practice includes defending clients from the Internal Revenue Service, the U.S. Department of Justice, the Oklahoma Tax Commission and other federal and state regulatory agencies, He handles a wide range of matters—from sensitive audits and administrative proceedings to civil tax litigation and government investigations.
Helping highly regulated organizations manage risk
Jeff regularly advises clients in highly regulated industries, including healthcare, gaming, cannabis, alcohol and nonprofit organizations. He counsels them on governance, compliance, internal controls and recordkeeping with the philosophy that every business should operate as though its books and records will someday be examined. By encouraging clients to “dot all the I’s and cross all the T’s,” he helps them reduce risk before problems arise and respond effectively when they do.
Preparing every case as though it will go to trial
Drawing on five years of experience as a certified public accountant before entering the legal profession, Jeff understands both the technical mechanics of tax compliance and how financial evidence ultimately plays out in litigation. He covers every matter thoroughly, by gathering all the relevant facts and crafting persuasive narratives, so clients are ready whether a matter resolves through negotiation or proceeds to trial.
Building confidence during difficult situations
Because many clients seek legal counsel only after receiving an audit notice or investigation or enforcement action, Jeff recognizes the importance of providing both strategic guidance and reassurance. Clients frequently describe him as a steady presence who explains complex issues in clear, straightforward terms, helping them understand their options while reducing uncertainty. He also works closely with certified public accountants and other professional advisors, encouraging them to involve experienced tax counsel early whenever an unusual or concerning issue arises.
