Cozen O'Connor is facing allegations that it failed to properly handle conflicts in a multimillion-dollar construction law arbitration after hiring a group of construction lawyers from Pepper Hamilton.

When it announced the hires in April, Cozen O'Connor said the new partners would help elevate the construction practice on a national and international scale. But a former client of those partners, Henry McNeil, alleges that the firm gained an unfair advantage for its client, E.B. Mahoney Brothers, through the lateral hires.

McNeil filed a complaint late last month in the Philadelphia Court of Common Pleas, seeking to disqualify Cozen O'Connor from representing Mahoney under the Pennsylvania Rules of Professional Conduct. McNeil had worked with lawyers from Pepper Hamilton for over a year in his arbitration claims against Mahoney, until they left for Cozen O'Connor.