John G. Fenn at a glance
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- Justice
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- Wyoming · State
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John G. Fenn
Justice · Wyoming Supreme Court
Biography
Professional career
- American lawyer and jurist who has held the role of a justice of the Wyoming Supreme Court since January 17, 2022, after a long career in Wyoming state courts and legal practice.
- 2022–present: Justice of the Wyoming Supreme Court, appointed by Governor Mark Gordon on December 2, 2021, to replace Justice Michael K. Davis
- 2007–2022: Judge of the Wyoming Fourth Judicial District Court, covering Sheridan and Johnson counties
- Previously Fourth Judicial District judge in Sheridan, 2007-2021, and Yonkee & Toner practitioner
- Attorney, Yonkee & Toner LLP; 1993-2006
- Before entering the judiciary, Fenn practiced law and was a partner at Yonkee & Toner from 1993 to 2006.
- As a justice, Fenn participates in the court’s function as the final arbiter of Wyoming state law cases, hears appeals from district courts, and helps shape binding precedent for the state
Education
- University of Wyoming College of Law — J.D. (1993)
- Master of Engineering — Air Force Institute of Technology — 1989
- M.Eng. — Air Force Institute of Technology — 1989
- M.S. in Engineering from the Air Force Institute of Technology (1989)
- University of Wyoming — B.S. (1984)
- B.A. in Mechanical Engineering from the University of Wyoming (1984)
Additional information
- In summary, John G. Fenn is a veteran Wyoming jurist with a background in engineering, law, and state court service, now serving on the state’s highest court and re-elected in 2024.
- Sworn in January 18, 2022.
- 2019–2022: Played a role in developing Wyoming’s chancery court system.
- Fenn’s appointment followed a nomination process in which he was one of three candidates recommended to the governor.
- Justices serve eight-year terms and must be retained by voters after one year in office.
- John G. Fenn grew up in Big Piney, Wyoming, and graduated from Big Piney High School.
Applicable Court Rules & Procedures
Cameras And Communication Devices
Courtwide
Wyoming Supreme Court Rule 5 restricts recording and wireless device use during its proceedings. Counsel may use muted internet-capable laptops at counsel table unless otherwise ordered; other wireless devices require express permission.
Use of Cameras: Communication Devices (Rule 5. of Rules of Sup. Court).Use of Cameras: Communication Devices, Rule 5 of the Rules of the Supreme Court ↗
Sources
Identity source checked August 22, 2026.
Biography sources checked October 11, 2026.
Wyoming Judicial Branch official judicial roster
Identity source · HTML · Source checked August 22, 2026
View Wyoming Judicial Branch official judicial roster ↗Use of Cameras: Communication Devices, Rule 5 of the Rules of the Supreme Court
Statewide source · HTML · Source checked July 29, 2026
View Use of Cameras: Communication Devices, Rule 5 of the Rules of the Supreme Court ↗Wikidata: John G. Fenn
Identity source · HTML · Source checked August 2, 2026
View Wikidata: John G. Fenn ↗Wyoming Supreme Court official biography: John G. Fenn
Identity source · HTML · Source checked August 8, 2026
View Wyoming Supreme Court official biography: John G. Fenn ↗Wyoming Supreme Court current justices and official biographies
Identity source · HTML · Source checked October 3, 2026
View Wyoming Supreme Court current justices and official biographies ↗Rules of the Supreme Court of Wyoming, Rule 5
Identity source · PDF · Source checked October 3, 2026
View Rules of the Supreme Court of Wyoming, Rule 5 ↗