Kathleen M. "Katie" O'Sullivan

4.6 (39 reviews )

Seattle Washington United States

Appellate Practice Bet-the-Company Litigation Commercial Litigation

Recognized in Best Attorney USA since 2009

206-359-8000 Website

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.

Practice Areas

Appellate Practice

Bet-the-Company Litigation

Commercial Litigation

Case History

Education

Georgetown University

Yale University

Professional Affiliations

Awards & Recognition

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Reviews

4.6 / 5

39 Reviews

1,048 Profile Views

Hope Swaniawski

Jan 31, 2026

Five stars for the incredible team at Kathleen M. "Katie" O'Sullivan in Seattle - they are amazing

Kathleen M. "Katie" O'Sullivan is fantastic and very professional. Don't hesitate to hire them if you're in Washington and need help. They really know their stuff and will go the extra mile to make su...

Jamie Hammes

Jan 31, 2026

So happy with the results of my case thanks to the hard work of Kathleen M. "Katie" O'Sullivan and staff

If you're looking for someone who actually cares and will fight for you, go to Kathleen M. "Katie" O'Sullivan. They helped me out big time with my Appellate Practice law issue and kept me informed at...

Tommie Lind

Jan 31, 2026

Absolutely Great! I couldn't be happier with the service from Kathleen M. "Katie" O'Sullivan

Sarah Medhurst

Jan 31, 2026

Many thanks to Kathleen M. "Katie" O'Sullivan for the hard work and dedication to my legal matter

Tasha Stark

Jan 31, 2026

Five stars for the incredible team at Kathleen M. "Katie" O'Sullivan in Seattle - they are amazing

If you need a Appellate Practice law lawyer, Kathleen M. "Katie" O'Sullivan is the one to call. Great job and very responsive team. They kept me in the loop and always had time to explain the details...

Kathleen M. "Katie" O'Sullivan

About Kathleen