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

1,047 Profile Views

Penny Bartoletti

Jan 31, 2026

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

I was really stressed about my case in Seattle, but Kathleen M. "Katie" O'Sullivan made everything so smooth and stress-free. Seriously, the best decision I've made lately was hiring them. They handle...

Clarence Nicolas

Jan 31, 2026

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

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...

Sheldon Stokes

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...

Kristin Aufderhar

Jan 31, 2026

Kathleen M. "Katie" O'Sullivan did a great job handling my complex Appellate Practice law case from start to finish

I've worked with a few lawyers in Seattle over the years, but Kathleen M. "Katie" O'Sullivan stands out for their honesty and thoroughness. They were clear about the process and kept me updated at all...

Yolanda Goldner

Jan 31, 2026

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

Kathleen M. "Katie" O'Sullivan

About Kathleen