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Professional Experience


Judge Trenaman has over 22 years of experience in the Louisville legal community.


experienceJefferson District Court Judge
Judge Mason Trenaman currently presides over one of the four felony/misdemeanor dockets in the Jefferson District Court. He was nominated for this position by the Judicial Nominating Commission, which is comprised of the Chief Justice of the Supreme Court of the Commonwealth of Kentucky, two attorneys, and four citizens. Following this review and recommendation of the Judicial Nominating Commission, Judge Trenaman was appointed by the Governor of the Commonwealth of Kentucky.


Jefferson Circuit Judge
During his four years as a Circuit Judge presiding in the Jefferson Family Court, Judge Trenaman heard cases involving all aspects of Family Law. The majority of cases involved adoptions, custody, divorce, paternity, dependent, abused and neglected children, and domestic violence. As a Family Court Judge, Mason participated in the National Council of Juvenile & Family Court Judges. His involvement in the Council included the following:


National Council of Juvenile & Family Court Judges

  • Member of Permanency Planning for Children Committee 1998-2000
  • Lead Judge for Kentucky Team on Diversion Model Courts Pilot Project 1997-2000
  • Author/presenter of Resource Guidelines Chapter on Reasonable Efforts requirements under PL 96-272 and Safe Children & Families Act of 1996
  • Presenter at numerous Reasonable Efforts and Diversion Project Judicial Educational Programs
  • Visiting Lecturer on permanency planning for children


Assistant Commonwealth’s Attorney
Mason served as a prosecutor in this office for three years. In this capacity, he prosecuted cases in the General Trial Division and later progressed to the Career Criminal Bureau, prosecuting repeat felony offenders classified as PFOI.Mason was one of the first two prosecutors in Jefferson County to specialize in narcotics prosecution and was the author of the first Asset Forfeiture Manual for use in narcotic cases in the Commonwealth of Kentucky. Mason also became a member of the Fatal Accident Support Team (FAST), which investigated and prosecuted vehicular homicide cases. Mason began his school mentoring efforts as a presenter for Operation Sober, an educational program for high school students concerning the perils of drunk driving.


Assistant Jefferson County Attorney
During his five year tenure in this office, Mason prosecuted cases in the felony/ misdemeanor, traffic, mental inquest, disability, paternity, and non-support divisions of the Jefferson District Court.


Private Civil Practice
Prior to joining the District Court bench, Judge Trenaman was engaged in an extensive private civil practice. In that practice he handled cases from the relatively minor to cases involving literally multi-millions of dollars. In each of those cases, no matter how simple or “minor” they may have appeared to the world at large, Judge Trenaman was always mindful that to the individuals involved, their case was truly the “case of a lifetime.”


Judge Trenaman began his legal career while still a student at the University of Louisville, Brandeis School of Law, when he served as an intern with the United States Army Judge Advocate General’s Corps. He was one of fifty law students accepted worldwide for this position. Mason served this internship under the tutelage of then Colonel (later Brigadier General) John S. Cooke. Mason later served as an intern/law clerk for former Mayor of the City of Louisville and former United States Congressman Frank W. Burke, Sr.