Duke Halley graduated from Sharon High School in 1966 and Southwestern Oklahoma State University. This was followed by admission to the Oklahoma University School of Law and graduation in 1973. He has been admitted to practice before the United States Supreme Court as well as other Federal courts and the Oklahoma Bar Association. He has extensive trial experience and has participated in litigation in Arkansas, Kansas, New Mexico and Texas as well as Oklahoma.
        Mr. Halley has been admitted to numerous professional groups and has served as an officer of many. For example he has been inducted into prestigous groups such as the American College of Trial Lawyers and the American Board of Trial Advocates. He has also served in many capacities dedicated to fair and meaningful access to justice by all members of society. He has been appointed to many duties. These include being appointed to a selection committee for appointment of Federal District Judges, a member of the Professional Responsibility Tribunal assigned the responsibility of conducting trials in disciplinary proceedings involving members of the legal profession, and election to the Judicial Nominating Committee which recommends judicial appointments to the Governor.
        He has served as the President of the Oklahoma Trial Lawyers Association (now the Oklahoma Association of Justice), an association dedicated to the preservation of rights for hurt people and the right to trial by jury.
        Mr. Halley was born in 1948, in Vici, Oklahoma, a small community in Northwestern Oklahoma. His father took a job with an oil company when he was 2 years old. This required many moves over the next few years. He went  to 15 schools his first three years of public education. Those schools ranged from Pensacola, Florida to Devil's Lake, North Dakota. The family moved back to Northwest Oklahoma when Duke was in the 4th grade and remained there. The roots grew deep. He owns land that his great grandfather claimed in the land run and one of his favorite ways to spend his "leisure time" is working with his cattle herd and farming.
        Upon graduating from law school Mr. Halley moved back to Northwestern Oklahoma and joined a law firm in Woodward. His early years involved the general practice of law. His passion became trying lawsuits and preparing them for trial or settlement. After 9 years he opened his own office in order to concentrate more on this type of practice. As that practice grew he found himself in Oklahoma City on a regular basis and an office was opened there in 2004.
        Mr. Halley has been involved in various types of cases. For example, in one case iodine producers were extracting natural gas from its product and not paying the mineral owners for it. Mr. Halley sued the companies on behalf of a group of mineral owners. The case was tried , and after being appealed to the Oklahoma Supreme Court resulted in a settlement which returned Millions of dollars to the mineral owners. He also successfully obtained a ruling from Oklahoma Supreme Court that establishments who negligently or knowingly sell alcoholic beverages to minors are legally responsible when persons are injured as a result. He then helped obtain a $2,500,000.00 verdict against a large convenience store chain for the family of a minor killed in an automobile collision after he and some other minor's were sold beer by the store manager. In another case State Farm Insurance Company unreasonably refused to pay $10,000.00 underinsured motorist benefits. The case was tried resulting in a verdict of $50,000.00 for actual damages and $400,000.00 punitive damages.
        There have been many seven figure settlements reached involving oil field accidents, medical malpractice and truck/auto collisions.
        Despite his success in larger cases, Mr. Halley continues to handle cases of all sizes. He is firmly dedicated to providing legal assistance to anyone who has not been treated fairly.