Hahn, who previously held senior jobs at two other industrial manufacturers, Honeywell and Allentown-based Air Products & Chemicals Inc., had arrived with recommendations for his experience with multinational sales from his predecessor, former Axalta CEO Charlie Shaver, who remains the company's board chairman. The company did not release details about the investigation and fast departure, or explain why the undisclosed conduct issue wasn't identified and dealt with before Hahn was hired.