May 15 (Reuters) - Boral Ltd BLD.AX :
* DAVID MARINER WILL STEP DOWN FROM HIS ROLE AS PRESIDENT & CEO END OF MAY
* ERIC MILLER WILL BE ACTING PRESIDENT, ROOFING NORTH AMERICA
* DARREN SCHULZ, CURRENT PRESIDENT, BORAL ROOFING NORTH AMERICA TO BE ACTING PRESIDENT & CEO OF BORAL NORTH AMERICA.