Peggy Williams  Rasmussen - Of Counsel, Seattle

Peggy Williams Rasmussen

Of Counsel | Seattle

Peggy is a highly skilled commercial litigator and arbitrator. Her litigation practice focuses on complex commercial litigation in the areas of contract disputes, antitrust, energy, utility regulation, computer software and hardware, environmental litigation, real estate, insurance coverage, and intellectual property. Her superb analytical and brief-writing skills have led to clients' success in a wide range of complex and precedent-setting litigation.

Peggy has arbitrated a wide variety of disputes, serving as sole arbitrator and as an arbitration panel member. Peggy is a member of the American Arbitration Association's Commercial Panel of Arbitrators and the Financial Industry Regulatory Authority (FINRA) Panel of Arbitrators. She also serves on the AAA's Specialty Roster for FRAND Disputes, dealing with disputes arising out of patent owners' obligation to license standard-essential technology patents on fair, reasonable and non-discriminatory (FRAND) terms. Peggy has arbitrated many disputes for King County Superior Court's Mandatory Arbitration Program.


  • Washington
  • U.S. Supreme Court
  • U.S. Court of Federal Claims
  • U.S. Court of Appeals for the Ninth, 10th, 11th and Federal Circuits
  • U.S. District Court for the Western District of Washington
  • Washington Supreme Court


  • University of Washington, J.D., Order of the Coif, Executive Editor, Washington Law Review
  • University of Washington, B.A., cum laude, Phi Beta Kappa

Recognition & Honors

  • AV rated by Martindale-Hubbell Peer Review

Representative Work

  • Defense of Snohomish County in civil actions arising from 2014 Oso landslide.
  • Defense of Microsoft in Department of Justice and multistate class actions alleging tying of operating system and browser and application software.
  • Energy matters involving oil and gas royalties, natural gas pipelines, and wholesale contracts for electricity, including claims by California power utilities against the United States and municipalities for hundreds of millions of dollars in overcharges on wholesale power sales.
  • Litigation between Microsoft and Motorola Mobility, Inc. over patent licenses for technology used in Microsoft's Xbox.
  • Construction and real estate disputes, including an action for construction defects and architectural malpractice involving a luxury home in Sun Valley, a lease dispute over a lessee's technological improvements to a commercial building, and a suit for partition of a large tract of property in the Seattle area.
  • Litigation between ASARCO and the United States concerning governmental responsibility for environmental contamination caused by World War II mining in Idaho.
  • Breach of contract action by the State of Alaska against the United States to enforce provisions in the Alaska Statehood Act governing division of oil and gas royalties from federal lands in Alaska.