Kathleen M. "Katie" O'Sullivan
Recognized since 2009
Seattle, Washington
Appellate Practice
Bet-the-Company Litigation
Commercial Litigation
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.
- 1201 Third Avenue, Suite 4900
Seattle, WA 98101-3099
- 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
Perkins Coie LLP 239 The Best Lawyers in America® awards
353 Best Lawyers: Ones to Watch® in America awards
Visit Website View Firm Profile - Appellate Practice, Seattle (2026)
- Bet-the-Company Litigation, Seattle (2025)
- Appellate Practice, Seattle (2024)
- Appellate Practice, Seattle (2016)
- Appellate Practice
- Bet-the-Company Litigation
- Commercial Litigation
- Appellate
- Civil Litigation
- Class Actions
- Complex Litigation
- 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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