Phineas Leahey focuses on appellate litigation and complex civil litigation. He has worked on dozens of motions and appeals in state and federal courts on a wide variety of subject matters such as securities law, RICO, accounting malpractice, consumer protection, class certification, and personal jurisdiction.

In his pro bono practice, Phineas has briefed and argued several cases, including a successful appeal to the U.S. Court of Appeals for the Second Circuit in 2007, Seidemann v. Bowen, in which the panel ruled, as a matter of first impression in the Second Circuit, that the First Amendment prohibits public sector unions from requiring nonmember employees to annually renew their objections to political and ideological expenditures unrelated to implementation or ratification of their collective bargaining agreements.

Phineas is an adjunct professor of legal writing and advocacy at the Benjamin N. Cardozo School of Law.