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

1,046 Profile Views

Marco Purdy

Jan 31, 2026

A huge weight off my shoulders thanks to the amazing work of Kathleen M. "Katie" O'Sullivan

I've already told all my friends and family about Kathleen M. "Katie" O'Sullivan. If you need Appellate Practice law help in Washington, they're the ones to see without any doubt. They are local exper...

Jean Barrows

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...

Ethel Brown

Jan 31, 2026

The absolute best in Seattle for Appellate Practice law - and I mean that from the bottom of my heart

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...

Tyrone Bernhard

Jan 31, 2026

Really helpful and compassionate service from everyone at Kathleen M. "Katie" O'Sullivan's firm

Rachael Steuber

Jan 31, 2026

Excellent legal representation provided by Kathleen M. "Katie" O'Sullivan for my Appellate Practice law case

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...

Kathleen M. "Katie" O'Sullivan

About Kathleen