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Portrait of Hon. Marialyn Barnard

Hon. Marialyn Barnard

Judge · Seat 4A

Texas Business Court · Fourth Business Court Division (San Antonio)

Biography

Judge Marialyn Barnard was appointed by Governor Abbott as a Judge of the Fourth Business Court Division effective September 1, 2024. She has worked in business, private practice, and government. Her previous eleven years of judicial experience includes Judge of the 73rd Judicial District Court in Bexar County and Justice on the Texas Fourth Court of Appeals. She also served on the Bexar County Commissioners Court as Commissioner for Precinct 3. Before her judicial service, Judge Barnard served as an Assistant United States Attorney in the Western District of Texas. She then worked for over 10 years in business as Managing Director of Forensic Litigation for KPMG LLP, In-house Counsel and Director of Business Intelligence for CPS Energy and Vice President of Product Development for TXdocs Software. She also worked as an attorney in private practice at Prichard, Hawkins, McFarland & Young LLP. She is and has been a member of several legal bar associations, committees and civil groups. Judge Barnard received her J.D. from St. Mary’s University School of Law, and as a student, she was an intern for Justice John Cornyn on the Texas Supreme Court and Judge Charles Baird on the Texas Court of Criminal Appeals. Upon graduation, she served as a briefing attorney for Justice Orlando Garcia on the Texas Fourth Court of Appeals as well as a federal law clerk when he became a U.S. District Judge for the Western District of Texas. Prior to law school, Judge Barnard was a high school English teacher after receiving her undergraduate degree in Political Science and English from Texas A&M University Commerce. She also worked in insurance and banking. Judge Barnard is married to her high school sweetheart Dr. Gary Barnard PhD, Clinical Psychologist. They have two children, a married daughter and married son, as well as four grandchildren.

Source: txcourts.gov

Opinions by Judge Barnard (1)

Trade Secret Protection ×
2026 Tex. Bus. 60 Discovery August 17, 2026

Outside Counsel Not of Record Denied Access to AEO Materials in Trade Secrets Case

In Unimachts Global v. Ayr Energy, the Business Court of Texas denied India-based BTG Advaya attorneys—not counsel of record—access to Confidential Information and Attorney's Eyes Only discovery materials in a trade secrets dispute between rival transformer manufacturers. The court rejected plaintiffs' plain-language interpretation of the protective order and applied the traditional balancing test used in trade secret cases to deny access to the non-appearing foreign counsel.

Mem. Op. TUTSA Protective Orders Attorney's Eyes Only Discovery Disputes Section 134A.006 Opinion PDF ↓