Dennis Tessier

Seattle, Washington
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About Dennis Tessier

Mr. Tessier has handled thousands of cases, hundreds of in-court proceedings, mediations and arbitrations, including rocket docket restraining orders and preliminary injunction prosecutions, more than 36 jury trials and 54 plus appellate matters, many of which have resulted in published opinions, including practice before the United States Supreme Court. His work has contributed to molding significant elements of the nation's jurisprudence for a client base consisting of individuals, law firms, law enforcement agencies, military concerns, government entities and Fortune 100 corporations across North America, South America, Asia and Europe, including criminal and civil antitrust and competition law matters before the Antitrust Division of the U.S. Department of Justice, the U.S. Federal Trade Commission, various state attorneys general, the International Trade Commission, the U.K. Office of Fair Trading and Competition Commission, and the European Commission.

Practice Areas

  • Antitrust
  • Appeals & Appellate
  • Commercial Litigation
  • Constitutional Law
  • International Law
  • Legal Malpractice

Jurisdictions Admitted to Practice

  • CurrentActivities: American Bar Association
  • CurrentActivities: American Trial Lawyers Association
  • CurrentActivities: United States Judge Advocates Association
  • CurrentActivities: Washington State Trial Lawyers Association
  • CurrentActivities: Washington State Paralegal Association
  • CurrentActivities: Notary Public - State of Washington

Professional Experience

  • K&L Gates Current


  • University of West Los Angeles School of Law 1989Certificate
  • University of West Los Angeles 1987Certificate


925 Fourth Avenue, Suite 2900
Seattle, WA 98104 USA

Telephone: (206) 370-6630
Fax: (206) 623-7022

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