William Stallings

Mayer Brown

William H. Stallings is an Antitrust & Competition partner in Mayer Brown’s Washington DC office. Previously, he spent 17 years at the US Department of Justice’s (DOJ) Antitrust Division, culminating with his service as the Chief of the Transportation, Energy, and Agriculture Section.

Bill advises clients on a full range of competition and consumer protection issues, including DOJ/FTC merger compliance and litigation; private antitrust litigation, including class actions; and global and US government competition and consumer protection investigations.

For his outstanding service in antitrust enforcement, the DOJ awarded Bill the prestigious Neil E. Roberts Award (2015). In 2016, the National Law Journal recognized Bill as an Antitrust Trailblazer.

Since joining Mayer Brown in 2015, Bill has handled several high-profile client matters, including serving as lead antitrust counsel in a multibillion-dollar merger that closed successfully following a DOJ second request investigation and private litigation. Bill is also active in the following capacities:

  • Non-Governmental Advisor (on behalf of the US DOJ) to the International Competition Network (ICN), an international organization of more than 100 competition agencies with the common aim of addressing practical antitrust enforcement and policy issues.
  • Co-chair of the new Antitrust, Competition and Consumer Protection Committee of the American Bar Association’s (ABA) Air & Space Forum.
  • Vice-chair of the Transportation and Energy Industries Committee of the ABA’s Antitrust Section.

Bill is a co-leader of Mayer Brown’s Aviation industry group and assists clients (including airlines, airports, executives, handlers and investors) in navigating complex competition issues in the aviation sector. He is familiar with the approaches of the most active competition authorities on the assessment of mergers, alliances and code-sharing agreements in this sector.

As chief of the Transportation, Energy, and Agriculture Section at the DOJ, Bill was responsible for civil antitrust enforcement, competition advocacy and competition policy in areas such as domestic and international aviation, electricity, oilfield services and agricultural commodities.

He supervised the section’s investigations of antitrust violations, managed dozens of second-request merger matters, shaped substantive analyses, engaged with international antitrust authorities, presented matters to DOJ leadership and litigated enforcement actions. Bill was appointed assistant chief of the section in 2005 and chief in 2011.

Education :

  • University of North Carolina at Chapel Hill, BA
  • University of North Carolina School of Law, JD

Admissions : District of Columbia

Experience :

  • Lead antitrust counsel to Virgin America in its multibillion-dollar acquisition by Alaska Airlines in 2016, creating the fifth-largest airline in the United States. Bill advised Virgin America on the antitrust considerations relating to the sale, represented the company before the US Department of Justice’s (DOJ) Antitrust Division throughout the department’s in-depth review and handled private litigation that threatened to derail the transaction.
  • Advised numerous domestic and global companies on the antitrust implications of potential transactions under consideration.
  • Developed the legal precedent in the KeySpan and Morgan Stanleycases for holding financial institutions liable for Sherman Act violations arising from the use of derivative agreements.
  • Led the Antitrust Division’s investigation of US Airways’ acquisition of American Airlines, which resulted in the divestiture of an unprecedented number of slots and gates at some of the most important US airports.
  • Directed the Antitrust Division’s investigation of the merger of National Cinemedia and Screenvision, the two top US cinema advertising networks. The parties abandoned the transaction shortly before trial.
  • Served as a key member of the successful trial, appellate and judgment compliance teams in United States v. Visa.


Rate : $$$

What types of cases Attorney William Stallings & Mayer Brown can handle?
Mayer Brown can handle cases related to laws concerning Litigation, Antitrust & Trade, Aviation, Transportation, Energy Utilities & Environmental. We manually verify each attorney’s practice areas before approving their profiles and reviews on our website.
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