Mary Byars

Mary represents both plaintiffs and defendants in a wide variety of complex commercial litigation, with an emphasis on oil and gas disputes, pharmaceutical defense, and appellate matters.  She has handled cases involving joint operating agreements and other contracts, legal malpractice, fraud, and statutory interpretation, among other issues.  Mary has resolved disputes through pre-suit negotiations, at the trial court stage, and on appeal.  She also represents clients in front of the Railroad Commission.

Bar Admissions & Activities

Admitted to the State Bar of Texas, the United States District Courts for the Western, Northern, and Southern Districts of Texas, and the United States Court of Appeals for the Fifth Circuit.

Austin Bar Association, Member

Austin Young Lawyers Association, Member


Harvard Law School, J.D., cum laude, 2015

Smith College, B.A., summa cum laude, 2010

Representative Matters

Won summary judgment and subsequent appeal in favor of an oil and gas company based on the interpretation of a contested mineral deed.

Part of trial team that obtained directed and jury verdicts in favor of an oil and gas company on claims of fraud and breach of joint operating agreement.

Represented operator client in AAA arbitration on drainage and royalty claims.

Ongoing representation of manufacturer in federal multidistrict litigation involving pelvic mesh products.
Assisted in successful settlement of lawsuit involving claims of legal malpractice.

Helped settle dispute regarding the valuation of shares of client company’s stock.

Advised startup company on legal ethics issues.

Assisted oil and gas clients in obtaining RRC approval of waterflood units.


Common Interest Doctrine – Including Multi-State Privilege Issues, Texas Bar CLE Advanced Business Law Course, November 2017 (co-author and co-presenter with David Shank).

The Common Interest Doctrine (or Lack Thereof) in Texas, Texas Bar CLE Webcast, December 2016 (co-author with David Shank).