Jack G. B. Ternan


Paralegal: Monica Zeimaran

Legal Secretary: Carla Vela


Mr. Ternan is a partner at Chamblee Ryan.  Mr. Ternan has represented clients with complex legal disputes at the trial and appellate level in state and federal courts across the United States and before arbitrators and mediators.  He has the experience to effectively and efficiently advocate the interests of clients in any forum across the country.

Mr. Ternan will represent clients in various practice areas and industries, including:

  • Arbitration
  • Antitrust
  • Appellate
  • Breach of Contract
  • Business, Commercial, and Other Civil Litigation
  • Constitutional law & Civil Rights
  • Construction Litigation
  • Fiduciary Litigation
  • Homeowner Rights
  • Hotel and Hospitality
  • Intellectual Property Litigation
  • Labor and Employment Litigation
  • Oil and Gas Litigation
  • Open Government
  • Partnership Disputes / “Business Divorce”
  • Products Liability
  • Real Estate Litigation
  • Shareholder Oppression

Mr. Ternan grew up in Plano, Texas, where he currently resides with his wife and three children.  In addition to practicing with Chamblee Ryan, P.C., he is the managing attorney of Ternan Law Firm, PLLC and was previously a partner with Bickel & Brewer, now known as Brewer, Attorneys & Counselors.  He has been named a “Texas Rising Star” from 2012 through 2022 by Texas Super Lawyers, a Thomson Reuters service.   Mr. Ternan serves as the Chair of the Finance Council for St. Mark the Evangelist Catholic Church and, in 2012, Mr. Ternan was the Democratic nominee for Texas Senate District 8.


Mr. Ternan has significant experience at the trial court level, including arbitrations, including:

  • Obtained a jury verdict awarding damages to a homeowner in dispute with general contractor.
  • Obtained multi-million dollar settlement on behalf of a senior executive who was wrongfully discharged by a healthcare company.
  • Obtained a temporary injunction against former employee in a trade secrets case on behalf of a large US manufacturer.
  • Obtained a dismissal with prejudice of a suit brought by a former employee against former employer for malicious prosecution.
  • Obtained a dismissal with prejudice on behalf of a consultant sued as part of a multi-million dispute with consultant’s employer.
  • Obtained a dismissal with prejudice on behalf of a former executive of an insurance agency.
  • Obtained a multi-million dollar award in an arbitration on a breach of contract claim behalf of a former employee against his former employer.
  • Obtained arbitration award in favor of oil and gas company against former manager of the company.
  • Obtained dismissal of shareholder derivative claims on behalf of corporation.

Mr. Ternan also has significant experience in the appellate courts, including the following:

  • Obtained a writ of mandamus vacating order excluding property owner testimony in an eminent domain  case.  In re Edukid, LP, No. 05-19-01239-CV, 2020 WL 1283924, at *1 (Tex. App.—Dallas Mar. 17, 2020, no pet.)
  • Established the precedent that citizens may obtain public referenda votes on comprehensive plans in the landmark Plano Tomorrow Plan suit.  Carruth v. Henderson, 606 S.W.3d 917, 920 (Tex. App.—Dallas 2020, no pet.)
  • Overturned a 20 year precedent that prohibited businesses from bringing counterclaims against the United States of America in a civil forfeiture case.  United States v. $4,480,466.16 in Funds Seized from Bank of Am. Account Ending in 2653, 942 F.3d 655, 659 (5th Cir. 2019)
  • Obtained a reversal of a judgment against an answering defendant who was held liable for a default judgment entered against his former employer. Christian v. Venefits, LLC, No. 05-17-01218-CV, 2018 WL 6187612 (Tex. App.—Dallas Nov. 27, 2018, no pet.)

Professional Associations

  • Multi-Million Dollar Advocates Forum
  • Collin County Bar Association
  • Chair, Finance Council, St. Mark the Evangelist Catholic Church
  • Policy Chair, Plano Citizens Coalition
  • Plano Chamber of Commerce



The University of Texas School of Law

  • JD, 2007
  • Texas Review of Law and Politics

Georgetown University

  • BA, 2004, Government & History
  • Philodemic Society



Supreme Court of the United States

United States Court of Appeals

  • 5th Circuit

United States District Court

  • Northern, Eastern, Southern and Western Districts of Texas


Rising Star, 2012-2022, Texas Super Lawyers, Thomson Reuters