Key Management

Rob Duke

President, Southeast Division, Oldcastle Materials, Inc.

Rob Duke is the President of Oldcastle Materials – Southeast Division, a building materials business employing more than 1,900 people across the southeastern U.S. Rob leads a family of Oldcastle companies engaged in the production and sale of asphalt, ready-mixed concrete, masonry block, aggregates, and paving services. Rob joined Oldcastle in 2008 as President of Preferred Materials, Inc., a newly formed company following Oldcastle’s acquisition of 32 concrete plants in Florida. In 2010, Rob’s role expanded at Oldcastle to include the construction, asphalt, and aggregate businesses in Florida. He was promoted to his current position in 2012. Prior to Oldcastle, Rob held progressive positions with Rinker Materials (now part of Cemex), as well as positions with Merck & Company and BOC Gases (now part of the Linde Group), where he held assignments in the U.S. and Europe. Rob earned a BS in Chemical Engineering and an MBA, both from Carnegie Mellon University in Pittsburgh, Pennsylvania.


Darryl Fales


President, Preferred Materials Concrete

Darryl Fales is President of Preferred Materials, Inc., Concrete Division. He holds a BA from the University of Central Florida, and an MBA from Florida Gulf Coast University. Darryl started his career in the concrete industry with Rinker Materials. He held multiple positions at Rinker including being selected to help design and implement the company’s new $100 million SAP software system. Upon completion of the company-wide SAP roll-out, Darryl was promoted to region manager with full P&L responsibility for Rinker’s operations in southwest Florida. After the divestment in 2007, Darryl joined Preferred Materials as Vice President South Florida, and continued his focus in the southern Florida markets. In June 2010, Darryl was an integral part of the Schwab Ready Mix acquisition, and led the integration of those assets into Preferred Materials. He was promoted to the position of President shortly after, and the business was reorganized with other Oldcastle Materials companies in Florida.

Nat Fisher

nfisherPresident, Preferred Materials Asphalt

Nat Fisher is President of Preferred Materials, Inc., Asphalt Division. He holds a BA from the United States Military Academy and an MBA from The Amos Tuck School at Dartmouth College. Nat started his career as an Army officer and then became a management consultant with the Boston Consulting Group and the Corporate Executive Board. He entered the construction materials industry as the Vice President for Strategy and Development for Lafarge Construction Materials and later became GM of their Great Lakes Aggregates business. He joined the Shelly Company (a division of Oldcastle Materials) in 2009 as Vice President and General Manager of the Northeast Ohio division. Nat was named President of APAC Southeast in 2012. In January of 2014, APAC Southeast became the Asphalt Division of Preferred Materials, Inc. or more simply, Preferred Asphalt.