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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.

Premises Liability

We defend companies in a broad array of industries, including businesses in the commercial, governmental and private sector, condominium and apartment buildings, housing, school districts and universities, as well as industrial and manufacturing plants. Our team of attorneys conducts thorough investigations of accident scenes, along with the combined efforts of experts and consultants to assist in the proper evaluation of liability, if any, and to minimize potential exposure. Our experience in premises liability cases runs the gamut from slip-and-fall injuries and civil actions arising from criminal assault and battery to traumatic brain injury cases, as well as fatalities and issues involving "green technology" and other environmental issues.

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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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