Jay A. Gilbertz

Jay A. Gilbertz is an attorney with Yonkee & Toner, LLP in Sheridan, Wyoming, where he focuses primarily on civil trial practice. He represents both plaintiffs and defendants in personal injury, wrongful death, business litigation, insurance defense, and other complex disputes. Gilbertz handles matters in Wyoming state, federal, and chancery courts and helps clients evaluate claims, prepare litigation strategies, and address significant financial, property, and business concerns.

Gilbertz earned a B.S. in Business Administration from the University of Wyoming in 1991 and a J.D. from the University of Wyoming College of Law in 1996. He joined Yonkee & Toner that same year. His business education and legal training provide a foundation for analyzing commercial relationships, damages, contracts, and liability issues while supporting a litigation practice that frequently involves technical evidence and complex factual records.

Gilbertz has substantial trial experience involving soil contamination, fires and explosions, property damage, business and contract disputes, and medical malpractice defense for physicians and hospitals. He also represents farming and ranching clients when litigation arises, including disputes involving oil and gas companies. His published appellate matters span environmental, healthcare, property, business, and trust-related disputes, reflecting experience in cases before both Wyoming and federal appellate courts.

Jay A. Gilbertz is a Fellow of the American College of Trial Lawyers and the International Society of Barristers and holds an AV Preeminent rating from Martindale-Hubbell. He previously chaired the Wyoming Chapter of the American College of Trial Lawyers and the Wyoming Commission on Judicial Conduct and Ethics. Gilbertz has also served with Court Appointed Special Advocates and provided pro bono services through Habitat for Humanity, combining extensive courtroom experience with professional and community service.

Law Office Affiliations

• Attorney, Yonkee & Toner, LLP
• Member, Wyoming State Bar

Licensed State

• Wyoming

Education

• University of Wyoming College of Law
  Juris Doctor (JD)
• University of Wyoming
  Bachelor of Science (BS)