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

1,054 Profile Views

Loretta Rutherford

Jan 31, 2026

Reliable lawyer you can count on - Kathleen M. "Katie" O'Sullivan provided excellent service throughout

Solid experience overall with the law firm of Kathleen M. "Katie" O'Sullivan. They know Appellate Practice law inside and out and gave me great advice. Very helpful and got the job done exactly as the...

Alicia Spencer

Jan 31, 2026

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

Everyone at Kathleen M. "Katie" O'Sullivan's office in Seattle was so nice and helpful. They made a tough situation a lot easier to deal with by being so patient and explaining everything clearly. I n...

Kelvin Donnelly

Jan 31, 2026

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

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...

Derek Schinner

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...

Kathleen M. "Katie" O'Sullivan

About Kathleen