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Dan Walker is a Shareholder of the Firm, which he rejoined in July 2017 after serving three years in the Health Care Division at the Federal Trade Commission.

Mr. Walker investigates and litigates complex cases on behalf of consumers and workers against some of the largest and most powerful companies in the world. Mr. Walker has helped recover hundreds of millions of dollars on behalf of plaintiffs, including in In re Loestrin 24 Fe Antitrust Litigation (settlements totaling $120 million for purchasers of hormonal birth control pills), In re Titanium Dioxide Antitrust Litigation (settlements totaling $163.5 million for purchasers of titanium dioxide), In re High Tech Employee Antitrust Litigation (settlements totaling $435 million for workers in the high tech industry), and Adriana Castro, M.D., P.A., et al. v. Sanofi Pasteur Inc. ($61.5 million settlement on behalf of pediatricians who purchased meningococcal vaccine). Mr. Walker was also a member of the trial team that successfully represented the Washington Mutual stockholders in a landmark bankruptcy court trial seeking to recover for losses sustained in the company’s sudden bankruptcy.

Mr. Walker’s current cases include, among others:

Simon and Simon, PC v. Align Tech., Inc., 3:20-cv-03754 (N.D. Cal.) (representing a class of dental practices in a monopolization case regarding clear dental aligners and digital dental scanners)

In re: Geisinger Health and Evangelical Community Hospital Healthcare Workers Antitrust Litig., 4:20-cv-00196 (M.D. Pa.) (representing a class of healthcare workers in a wage suppression case involving allegations of an illegal agreement between two hospitals not to recruit each other’s workers)

In re: Broiler Chicken Grower Antitrust Litig., 6:20-md-02977 (E.D. Okla.) (representing a class of chicken farmers in a pay suppression case involving allegations that the major chicken processors illegally shared farmer compensation information and illegally conspired not to recruit each other’s farmers)

In re: Rotavirus Vaccines Antitrust Litig., 2:18-cv-01734 (E.D. Pa.) (representing a class of pediatricians in a monopolization case in the market for pediatric rotavirus vaccine)

Henry, et al. v. Brown University, et al., 1:22-cv-00125 (N.D. Ill.) (antitrust case on behalf of current and former students of sixteen elite universities alleging the universities conspired to reduce financial aid awards)

City of Brevard, North Carolina v. HCA Healthcare, Inc., et al., 1:22-cv-114 (W.D.N.C.) (representing a class of payers in a monopolization and restraint of trade case against a major health system in Western North Carolina)

While at the Federal Trade Commission, Mr. Walker investigated and litigated antitrust matters in the health care industry. In addition to leading various nonpublic investigations in the pharmaceutical and health information technology sectors, Mr. Walker litigated Federal Trade Commission v. AbbVie Inc., et al., a case alleging that a brand pharmaceutical manufacturer engaged in sham patent litigation to delay generic competition, and Federal Trade Commission v. Cephalon Inc., a “pay-for-delay” lawsuit over a brand pharmaceutical manufacturer’s payment to four generic competitors in return for the generics’ agreement to delay entry into the market. The Cephalon case settled shortly before trial for $1.2 billion—the largest equitable monetary relief ever secured by the Federal Trade Commission—as well as significant injunctive relief.

In addition, Mr. Walker has spoken frequently on antitrust issues involving workers, health care, and intellectual property.

Mr. Walker is a magna cum laude graduate of Amherst College and Cornell University Law School, where he was an Articles Editor for the Cornell Law Review. Before entering private practice, Mr. Walker clerked for the Honorable Richard C. Wesley of the United States Court of Appeals for the Second Circuit.

Business and Community Leadership

Speaking Engagements :

  • D.C. Bar, Antitrust and Consumer Law Institute 2019, “Antitrust Considerations Raised by No-Poach and Non-Solicit Agreements,” September 26, 2019
  • Class Action Money & Ethics Conference, “Arbitration Clauses,” May 6, 2019
  • ABA, Section of Antitrust Law, “Antitrust Developments in Health Care Labor Markets,” October 30, 2018
  • ABA, Section of Antitrust Law, “Two-Sided Markets in Modern Antitrust: Beyond Ohio v. American Express,” February 15, 2018
  • Center for Innovation and Property Law, Annual IP/Life Sciences Symposium, “Latest Issues in Drug Patent Settlements,” April 7, 2016



Law School

J.D., Cornell University Law School, magna cum laude, Order of the Coif


B.A., Amherst College, magna cum laude

Honors & Awards:

D.C. Super Lawyer, 2020 – 2022


Member – New York Bar

Member – District of Columbia Bar

Admitted – United States Supreme Court

Admitted – United States District Court for the District of Columbia

Admitted – United States District Court for the Eastern District of Pennsylvania

Admitted – United States District Court for Eastern District of New York

Admitted – United States District Court for the Southern District of New York

Admitted – United States District Court for the Eastern District of Texas

Admitted – United States Court of Appeals for the First Circuit

Admitted – United States Court of Appeals for the Third Circuit

Admitted – United States Court of Appeals for the Fourth Circuit


Hon. Richard C. Wesley, United States Court of Appeals for the Second Circuit

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