About Kathleen
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.
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.
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.
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.
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.
Practice Areas
Case History
Education
Professional Affiliations
Awards & Recognition
- Lawyer of the Year: Appellate Practice, Seattle (2026)
- Lawyer of the Year: Bet-the-Company Litigation, Seattle (2025)
- Lawyer of the Year: Appellate Practice, Seattle (2024)
- Lawyer of the Year: Appellate Practice, Seattle (2016)
- Recognized: Appellate Practice
- Recognized: Bet-the-Company Litigation
- Recognized: Commercial Litigation
- Special Focus: Appellate
- Special Focus: Civil Litigation
- Special Focus: Class Actions
- Special Focus: 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
