About Mark
Mark Thetford earned his J.D. from Oklahoma City University School of Law in 1988. He moved into practice in Oklahoma shortly after graduation and has maintained a steady presence in the state's legal community since then. His academic training at OCU provided the foundation for a long career that has included courtroom work, settlement proceedings and bar association activity.
He has practiced law in Oklahoma for more than three decades. Over that time he has handled matters that required appearances in both trial and settlement settings. State officials have recognized his work in alternate dispute processes; he is a Certified Federal Adjunct Settlement Judge for the State of Oklahoma, a role that places him in settlement conferences and mediations tied to federal matters.
Thetford participates in multiple bar organizations. He is a member of the Oklahoma Bar Association and holds memberships in the Tulsa County and Muskogee County bar associations. He is also listed with national organizations including the American Bar Association, and belongs to O.A.J. and A.A.J. These affiliations reflect an ongoing engagement with professional peers and continuing legal education across jurisdictions.
Throughout his career he has split time among several practice locations in the state. He maintains offices in Oklahoma City, Tulsa and McAlester. That geographic spread has allowed him to take cases and consult with clients in both urban and more rural parts of Oklahoma. It has also given him familiarity with local court personnel and procedural variations across counties.
Colleagues describe Thetford as a lawyer who moves deliberately through legal problems. He prepares for hearings and settlement sessions in a methodical way and tends to favor practical solutions that resolve disputes without unnecessary delay. His work as a certified adjunct settlement judge complements his private practice by putting him in the role of neutral facilitator on occasions when parties prefer to negotiate rather than litigate to the end.
As of 2026 he continues to practice in Oklahoma and handles matters that involve settlement procedures, courtroom representation and client counseling across his offices in Oklahoma City, Tulsa and McAlester. His current practice focuses on courtroom and settlement work in Oklahoma.
