Philadelphia-based Hangley Aronchick Segal Pudlin & Schiller will undergo the first major leadership change in its 19-year history on January 1 of next year, when Chairman William T. Hangley steps down and hands over the reins to new Chairman Mark A. Aronchick and Vice Chairman Ronald P. Schiller.

The firm said the move marks the first step toward eventually transitioning key leadership responsibilities from the firm’s founders and senior shareholders to a younger generation of lawyers.