Kathleen M. "Katie" O'Sullivan

Appellate Practice

0.0 (0 reviews)

Seattle, Washington

16+ years experience

Updated: Dec 31, 2025

Contact Information

206-359-8000

https://www.perkinscoie.com/en/professionals/kathleen-m-o-sullivan.html

1201 Third Avenue, Suite 4900 Seattle WA US

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Bio

With a practice centered on Appellate Practice, Kathleen M. "Katie" O'Sullivan represents clients across Washington. Over over 15 years, M. "Katie" O'Sullivan has built a strong track record in Appellate Practice representation. As an attorney with Perkins Coie LLP, M. "Katie" O'Sullivan upholds the firm's standards of excellence. Clients benefit from M. "Katie" O'Sullivan's dedication to clear communication and responsive service. Based in Washington, M. "Katie" O'Sullivan offers experienced counsel and strong representation.

Practice Areas

Appellate Practice

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