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Mary Walser
Of Counsel
Mary Walser is of counsel in the firm’s Antitrust & Competition Practice Group in Washington DC. She has written and counseled on a wide range of antitrust topics and regularly handles multijurisdictional antitrust matters. Her experience covers a range of industries, including entertainment, healthcare, information technology, manufacturing, agriculture, transportation, telecommunications and media.
- Represented a global travel services provider in its sale to a competitor, including global merger control filings and antitrust investigations.
- Represented a US agriculture service provider in the sale of the company to its closest competitor, including successfully navigating an investigation before the Department of Justice (DOJ) Antitrust Division.
- Advised a US manufacturing company on its sale to a global competitor, overseeing international merger control filings and coordinating related investigations in multiple jurisdictions.
- Represented a medical device manufacturer in its sale to a competitor, including successfully navigating a Federal Trade Commission (FTC) investigation into the combination.
- Defended a leading container ship operator in a grand jury investigation focused on price fixing/bid rigging in the global shipping industry, and developed a global compliance program.
- Represented a putative class of consumer packaged goods companies against a dominant provider of in-store promotion and free-standing insert coupons.
- Defended a leading medical device manufacturer in a series of class action cases alleging monopolization of multiple product markets through the use of alleged refusals to deal, discount programs, and bundling of goods and services.
- Represented trade association US Chamber of Commerce in connection with litigation alleging violations of sections of the Sherman Act related to the exercise of monopoly power in the wholesale power market in the Carolinas.
- Advised a hotel trade association in connection with the FTC’s investigation into anticompetitive practices in the hospitality industry.
- Defended a telecommunications company in the DOJ antitrust review of its reverse merger with a competitor in a deal valued at over US$10 billion.
- Represented a broadcast television company in connection with the review of its merger valued at over US$2.2 billion.
- Represented a multinational agriculture corporation and fruit and vegetable producer in the sale to a competitor, including Hart-Scott-Rodino Act (HSR) and multiple global merger control filings.
- Defended a leading airline in connection with the DOJ antitrust review of and challenge to a merger valued at US$11 billion.
- Defended a South Korean multinational electronics company in the price-fixing civil litigation brought by individual purchasers and state attorneys general in federal and state courts regarding TFT-LCD flat panel displays.
Education
- College of William and Mary Marshall-Wythe School of Law, J.D., cum laude, 2012
- University of Virginia, B.A., 2006
Admissions
- District of Columbia, 2013
- Virginia, 2012
- Co-author, “FTC Staff Cuts Unlikely to Curb Antitrust Enforcement,” Law360, July 16, 2025.
- Co-author, “Taking Stock of Antitrust Efforts Targeting Private Equity,” Wall Street Lawyer, Volume 27, Issue 11, November 2023.
- Co-author, “US Merger Control in the High-technology Sector,” The Merger Control Review, 11th Edition, August 2020.
- Co-author, “Executive Summary: Panel Summaries from FTC-DOJ Workshop on Examining Health Care Competition, February 24-25, 2015,” American Health Lawyers Association Weekly, March 2015.
- Co-author, “New Faces on the Bench: Profile of District Judge Haywood Gilliam,” Antitrust and Unfair Competition Law e-Briefs, News and Notes, California Lawyers Association, February 2015.
- Co-author, Breaking the Glass Ceiling: Women in the Boardroom, A Study of Major Global Exchanges, 2014.
- Co-author, Responding to Federal Corporate Criminal Investigations, 2013.