• Fordham University School of Law, J.D.
      • College of the Holy Cross, B.A., History

    Bar Admissions

      • New York

    Court Admissions

      • New York State Courts
      • United States Court of Appeals for the Second Circuit
      • United States Court of Appeals for the Third Circuit
      • United States District Court for the Southern District of New York
      • United States District Court for the Eastern District of New York
      • United States District Court for the District of Vermont
      • United States Tax Court
      • United States Court of Claims



Jim Mahon has more than 30 years of experience as a civil and criminal litigator in Federal and State courts. Jim concentrates his practice on criminal and civil tax controversies, white collar criminal matters, and civil litigation. He represents clients facing criminal charges in state and federal courts, individuals under government investigation, and taxpayers before the Internal Revenue Service and the NY State Department of Taxation.

Jim’s commercial litigation practice includes banking, ERISA benefits and contributions, and securities matters. He has successfully represented clients subject to claims involving professional malpractice, labor and employment disputes, tax shelters, property allocation, matrimonial disputes, probate disputes, and disputes arising out of the misappropriation of databases and trade secrets.

Mr. Mahon serves as a mediator to the Commercial Part of the New York State Supreme Court, New York County. His practice also includes federal and state taxpayer representation in criminal and civil cases, business fraud, and other white-collar defense work. He has represented clients before various state and federal agencies, including the Internal Revenue Service, the New York State Department of Taxation & Finance, the SEC, the NASD, the EEOC and the NLRB. Prior to entering the legal profession, Jim served in the United States Peace Corps in Panama.