David Horniak litigates complex, high-stakes civil and criminal cases around the country at both the trial and appellate levels.  He has represented clients in a broad range of substantive areas of litigation, including criminal defense, government and internal investigations, patents and other intellectual property, food labeling, commercial disputes, securities, government contracts, and trusts and estates.  He has been named by Super Lawyers to the Washington, D.C. “Rising Stars” list for General Litigation (2014-2019).

Born in California and raised in Minnesota, David graduated with honors from Dartmouth College, where he rowed varsity crew.  After college, David worked in operations management for a distribution company in the Chicago area.  David received his J.D. from the University of Michigan Law School, where he graduated magna cum laude, was a member of the Order of the Coif, and served as an editor of the Michigan Law Review.  David clerked for Judge Ronald M. Gould of the U.S. Court of Appeals for the Ninth Circuit before joining Williams & Connolly in 2010.  He lives in the District of Columbia with his wife and son.

Representative Experience

  • Represented through trial a public company suing the District of Columbia for breaching a government contract for provision of technology
  • Represented the chairman of an investment firm in a DOJ criminal tax investigation
  • Represented Alcon, now a division of Novartis, in patent litigation relating to Travatan Z and Ilevro products
  • Represented multiple packaged-food manufacturers in California consumer class-action lawsuits alleging misleading labeling




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