Philip J. Sipling

Martin Marietta Aggregates produces construction aggregates. It supplies crushed stone, sand, gravel, asphalt and ready mix concrete products to contractors of highway and public infrastructure, residential and commercial projects. The company operates quarries and related facilities in the US, Canada and the Caribbean. Martin Marietta Aggregates is located in Raleigh, NC.

Martin Marietta Magnesia Specialties LLC produces magnesia chemicals and lime. It provides high purity magnesium oxide based products for environmental, industrial, nutritional and agricultural applications, and magnesium hydroxide products for use in everyday materials such as plastic, rubber, pulp & paper, ceramics, sugar, animal feed, aluminum, tile and motor oil. It is a wholly owned subsidiary of Martin Marietta Magnesia, Inc. The company is headquartered in Baltimore, MD.

The National Asphalt Pavement Association is a trade association that advocates for the interests of asphalt producers and contractors on a national level. The non-profit company is based in Riverdale, MD. The company works with Congress, government agencies, and other trade and business organizations.

Industrial Microwave Systems LLC designs patented microwave systems for continuous flow manufacturing processes that require rapid and uniform heating and drying. Its products include cylindrical heating system and planar heating system. The company is headquartered in Morrisville, NC.