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

1,052 Profile Views

Meredith Kautzer

Jan 31, 2026

Professional service and clear communication provided by Kathleen M. "Katie" O'Sullivan in Seattle

It's hard finding a reliable lawyer these days, but Kathleen M. "Katie" O'Sullivan in Seattle is definitely one of the good ones. Would use them again if needed without hesitation. They are profession...

Claire Dare

Jan 31, 2026

Highly recommend Kathleen M. "Katie" O'Sullivan for anyone needing expert Appellate Practice law help in Washington

Honestly, I can't thank Kathleen M. "Katie" O'Sullivan enough for everything they've done for me. They really know their stuff when it comes to Appellate Practice law and it shows in the results. 10/1...

Theresa Wiegand

Jan 31, 2026

A very good experience overall with the entire team at Kathleen M. "Katie" O'Sullivan's legal practice

Clara Rogahn

Jan 31, 2026

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

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...

Casey Frami

Jan 31, 2026

Would recommend Kathleen M. "Katie" O'Sullivan for sure to anyone in Seattle needing legal help

Just wanted to say a huge thanks to Kathleen M. "Katie" O'Sullivan and the staff. They really went above and beyond for me and my family during a very difficult legal battle. We couldn't have done it...

Kathleen M. "Katie" O'Sullivan

About Kathleen