William Marsh


Education and Clerkships

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

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


Texas, 2014

Court Admissions

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




Billy Marsh advises clients on their most challenging and complex legal issues. He has successfully represented large corporations, directors, officers, funds, and fund managers in high-stakes securities, shareholder, and class action litigation. In the course of those representations, he has developed expertise in fiduciary duties and attorney-client privilege and advises clients on those issues in complicated transactions. Billy has also represented clients in government investigations and enforcement proceedings, and clients often turn to him for advice on how to navigate complex laws and regulations that affect their business. Clients appreciate Billy’s ability to quickly understand the relevant legal issues and provide practical counsel and guidance.

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.


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.

Texas Bar Journal

Emily Westridge Black and William Marsh for Texas Bar Journal: Antitrust and Business Litigation

In 2015, the U.S. Supreme Court analyzed when state regulatory boards may invoke state-action antitrust immunity. The court also denied certiorari in an important civil antitrust case that focuses on application of the Foreign Trade Antitrust Improvement Act of 1982.

Year in Review

False Claims Act: Year in Review

The False Claims Act Year in Review 2018

The False Claims Act continued to be a significant focus of government and whistleblower activity in 2018. 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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