ALPHARETTA, Ga. – John Deere Landscapes has appointed Doug Black as chief executive officer effective immediately. 

Black is the former president and chief operating officer of Atlanta, Ga.-based Oldcastle, Inc., a $12.6 billion building materials manufacturer and distributor and wholly owned subsidiary of Irish-based CRH, plc. 

During Black’s 18-year career with Oldcastle, he helped build the company from $900 million in sales to the leader in North American building materials through strong internal and acquisitive growth and industry-leading operating performance.

Black succeeds David Werning, who will serve as an advisor to the business until his retirement at the end of 2014. 

During his tenure at Oldcastle, Black served as CEO and COO at both Oldcastle Materials and Oldcastle Architectural Products, which are strategic suppliers to JDL. In addition, he was president of Oldcastle Precast Southeast Division and, as VP development for Oldcastle, Inc., established Oldcastle’s distribution division with the acquisition of Allied Building Products.  Prior to Oldcastle, Black was with McKinsey & Company and the U.S. Army Engineer Corps.

He is a graduate of the U. S. Military Academy, West Point, N.Y., with a B.A. in mathematical sciences and an M.B.A. from Duke University’s Fuqua School of Business.