Duane Morris is facing a $625 million lawsuit for allegedly failing to file an appellate brief, but contends that the plaintiff was never a client of the firm.

Jeffrey Servin has filed a complaint in the Philadelphia Court of Common Pleas alleging negligence, breach of contract, tortious interference and misrepresentation. The complaint argued that Servin, as a 50 percent equity owner of First City Communications, was relying on Duane Morris to file an appellate brief on behalf of the company in the U.S. Court of Appeals for the Second Circuit, which the firm ultimately did not do.