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We are a national defense litigation law firm.

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Deasey, Mahoney & Valentini is a well-established national defense litigation law firm headquartered in Philadelphia.

Our clients benefit from our litigators’ collective experience in a variety of practice areas. For each matter they handle, senior litigators provide personal attention during all phases of representation and deliver exceptional, responsive service at a reasonable cost. 

In short, our attorneys strive to craft and deliver a superior product.


Deasey, Mahoney & Valentini lawyers are adept at representing insurers in subrogation matters including construction accidents and defects, crane accidents, fire and arson matters, commercial property losses, building collapses and transportation losses. In investigating and litigating subrogation claims, our attorneys draw on the comprehensive scope of practice experience among their colleagues to provide optimal legal services to our clients.

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Matthews v. Anthony’s Landscaping and Tree Company

On December 16, 2019, the Honorable Messiah Jackson of the Philadelphia Court of Common Pleas entered summary judgment in favor of Anthony’s Tree and Landscaping Company in a negligence action based upon Anthony’s Tree and Landscaping’s work performed on a tree located on a Prospect...

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