Appellate Practice Bet-the-Company Litigation Commercial Litigation
*Named the "Lawyer of the Year" in this practice area in the 2026 edition in Seattle.
Kathleen M. "Katie" O'Sullivan
Recognized in Best Lawyers since 2009 Awarded Practice Areas
Biography
Kathleen M. O'Sullivan is a top attorney recognized by Best Lawyers in the practice area(s) of Appellate Practice, Bet-the-Company Litigation and Commercial Litigation.
Kathleen M., who practices law in Seattle, Washington, has been recognized since 2009. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kathleen M. is held by other top lawyers in the same geographic and legal practice area.
Overview
- Georgetown University, J.D., graduated 1996
- Yale University, BA
- Washington, Washington State Bar Association
- American Law Institute - Member
- Federal Bar Association - Member
- Washington State Bar Association - Member
- United States Court of Appeals
- United States District Court
- Washington, Washington State Bar Association
- American Law Institute - Member
- Federal Bar Association - Member
- Washington State Bar Association - Member
- Georgetown University, J.D., graduated 1996
- Yale University, BA
- United States Court of Appeals
- United States District Court
Client Testimonials
Awards & Focus
Named "Lawyer of the Year" by Best Lawyers® for:
- Appellate Practice, Seattle (2026)
- Bet-the-Company Litigation, Seattle (2025)
- Appellate Practice, Seattle (2024)
- Appellate Practice, Seattle (2016)
Recognized in The Best Lawyers in America® 2026 for work in:
- Appellate Practice
- Bet-the-Company Litigation
- Commercial Litigation
Special Focus:
- Appellate
- Civil Litigation
- Class Actions
- Complex Litigation
Awards:
- 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
News & Media
Case History
Cases
- 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
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