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Kathleen M. O'Sullivan

Listed in Best Lawyers since 2009

Perkins Coie LLP


Case History

  • Other Court Admissions
      • U.S. Supreme Court
      • U.S. Court of Appeals for the Ninth Circuit
      • U.S. District Court for the Western District of Washington
      • U.S. District Court for the Eastern District of Washington


  • Co-Recipient of awards for IOLTA Supreme Court litigation (American Bar Association, Washington State Bar Association, King County Bar Association, Perkins Coie)
  • Listed in Washington Law & Politics, “Washington's Super Lawyers," 2007 - Present

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1201 Third Avenue, Suite 4900
Seattle, WA 98101-3099
Phone: 206-359-6375
Firm Phone: 206-359-8000

Practice Areas

  • Appellate Practice
  • Commercial Litigation (Appellate, Civil Litigation, Class Actions, Complex Litigation)


  • Yale University (BA)
  • Georgetown University Law Center (J.D.)

Bar Admissions

  • Washington State Bar Association

Organizations & Affiliations

  • American Law Institute — Member
  • Washington State Bar Association — Member
  • Federal Bar Association — Member


  • United States Court of Appeals
  • United States District Court