David Gringer

David Gringer is a trial-ready litigator with a focus on complex antitrust and consumer protection litigation. For example, he recently successfully represented a major telecommunications company at trial in litigation brought by the Washington Attorney General alleging violations of the state’s Consumer Protection Act and has litigated and tried several large-scale antitrust cases. He also has significant experience in responding to government investigations at both the federal and state levels. 

Prior to joining the firm, Mr. Gringer was a trial attorney in the Antitrust Division of the US Department of Justice. At the division, Mr. Gringer played a leading role in many of its highest-profile matters, including serving as a member of the division's winning trial teams in U.S. v. H&R Block—the division's first successful challenge to a merger in more than eight years—the e-books price-fixing litigation, and writing the division's litigation complaints in U.S. v. Anheuser-Busch and U.S. v. U.S. Airways.

In 2013, Mr. Gringer was selected for an individual Assistant Attorney General Award of Distinction for his work on U.S. v. H&R Block, U.S. v. BlueCross Blue Shield of Michigan, and the proposed and later abandoned 3M/Avery merger, among others.

Before joining the Department of Justice, Mr. Gringer served as a law clerk to the Honorable Michael Boudin of the US Court of Appeals for the First Circuit. He also has substantial political campaign management experience. During 2005, he was campaign manager for the successful Manhattan Borough president campaign of Scott Stringer, who now serves as New York City comptroller.



  • Secured a dismissal of all antitrust damage claims and claims brought under Section 1 of the Sherman Act on behalf of a public utility.
  • Successfully represented a major telecommunications provider at trial in consumer protection litigation. 
  • Secured the dismissal of a lawsuit alleging orchestrated hacking of computer systems.
  • Secured clearance from the Department of Justice after the issuance of a Second Request in a major transaction in the data network industry.
  • Represents a major telecommunications company in litigation brought by the Washington Attorney General alleging violations of the state’s Consumer Protection Act.
  • Represented a client in connection with antitrust agency and congressional investigations.
  • Represent online software company in Federal Trade Commission and State Attorney General investigations
  • Represented the indenture trustee for, and holders of, billions of dollars in bonds in the successful prosecution and appeal of “make whole” and related claims totaling approximately $600 million in the Energy Future Intermediate Holdings Company Chapter 11 case.
  • Represented a large telecommunications company in connection with multiple State Attorneys General investigations and consumer protection litigation against a State Attorney General.
  • Represented a large financial institution in an internal investigation related to a technology outage and threatened litigation against the responsible vendor; matter resulted in full indemnification for the client. 
  • Represented a foreign government in federal district court on issues involving the Foreign Sovereign Immunities Act.


  • Recipient of Assistant Attorney General Antitrust Awards of Distinction in 2010, 2011, 2012 and 2013

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  • Education

    • JD, Columbia Law School, 2008

      James Kent Scholar (2006-2008); Articles Editor, Columbia Law Review; Finalist, Stone Honors Moot Court Competition; Alexander Hamilton Fellow
    • BA, History, University of Pennsylvania, 2003

      summa cum laude
  • Admissions

    • District of Columbia

    • New York

  • Clerkships

    • The Hon. Michael Boudin, US Court of Appeals for the First Circuit, 2008 - 2009