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

1,051 Profile Views

Mandy Considine

Jan 31, 2026

Great people who truly care at Kathleen M. "Katie" O'Sullivan - the best legal team in Washington

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...

Eduardo Jast

Jan 31, 2026

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

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...

Leland Kihn

Jan 31, 2026

Simply amazing representation from Kathleen M. "Katie" O'Sullivan's office during my recent legal matter

I didn't think I'd find such a good lawyer in Washington, but here we are and I am thoroughly impressed. Kathleen M. "Katie" O'Sullivan is just awesome and exceeded all my expectations. No complaints...

Mona Emmerich

Jan 31, 2026

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

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...

Juana Reynolds

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

About Kathleen