William Marsh


Education and Clerkships

J.D., University of Virginia School of Law, 2014

B.S., Economics, Brigham Young University, 2011, cum laude



Court Admissions

U.S. District Court for the Northern District of Texas




Billy Marsh has successfully represented clients in high-stakes securities, shareholder, and class action litigation and advised clients on fiduciary duties and attorney-client privilege in complicated transactions. Billy has also represented clients in government investigations and enforcement proceedings. Clients appreciate Billy’s ability to quickly understand complex issues and provide practical counsel and guidance.


Health Law Vitals

Health Law Vitals - A Healthcare Newsletter from Haynes and Boone

The Haynes and Boone Health Law Vitals Newsletter explores significant developments and legislation in healthcare law. This edition discusses the fiduciary duties of directors in medical technology, the promises and pitfalls of telehealth, the FDA's expansion of the Abbreviated 510(k) pathway, and more.

Selected Client Representations

  • Defense of Putative Federal Securities Act Class Action in Texas State Court. Defending an international chemical manufacturer against a putative class action pending in Texas state court alleging violations of the federal Securities Act of 1933 in connection with two public stock offerings.
  • Dismissal of Securities Class Action for Healthcare Company. Obtained dismissal of securities class action filed against Tenet Healthcare challenging disclosures arising from regulatory proceeding.
  • Shareholder Derivative Suit Dismissals. Obtained dismissal of shareholder derivative suits filed against the board of directors of AT&T.
  • Defense of Securities Claims Brought against Hedge Fund and Fund Managers. Successfully defended BP Capital Management and related defendants in securities case alleging misrepresentations regarding hedge fund strategy. After filing a motion for summary judgment, obtained a voluntarily dismissal of plaintiffs' claims without the exchange of any consideration other than mutual releases.
  • Defeat of Class Action Bid in Environmental Litigation. Defeated class action bid for AT&T in a suit in federal court in Houston brought by property owners alleging that AT&T telephone cable buried underneath their properties — pursuant to easements that had been granted to AT&T in the 1950s — were contaminating their properties.
  • Defense of Oil and Gas Exploration Company in Shareholder Litigation before the Delaware Court of Chancery. Represented Sanchez Resources, LLC (a privately held oil and gas exploration company) and its president in shareholder derivative litigation before the Delaware Court of Chancery.

Year in Review

False Claims Act: Year in Review

The False Claims Act Year in Review 2019

The False Claims Act continued to be a significant focus of government and whistleblower activity in 2019. This Year in Review highlights several key developments.

Selected Publications and Speeches

  • “Developing Effective Compliance and Audit Committees,” Presenter, Clear Law Institute, May 2016. 
  • “Compliance Post Affordable Care Act,” author, New Perspectives of Healthcare Risk Management, Control and Government, February 2016.
  • “Antitrust and Business Litigation” author, Texas Bar Journal, January 2016.

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