Michael B. Pfieffer

Part of Vulcan Materials Co., Columbia Rock Products mines limestone for construction, concrete, and agricultural products. The company is based in Columbia, TN. Columbia Rock Products was acquired by Vulcan Materials Co. on February 02, 2004. Harry Allen Pressnell has been the CEO of the company since 1983.

The American Society of Civil Engineers, founded in 1852, is the oldest national engineering society in America. The non-profit company is based in Reston, VA and has subsidiaries in the United States. With over 150,000 members worldwide, the organization advocates for sustainable and resilient practices to maintain and modernize the nation's infrastructure. The company also works to increase investment in infrastructure and improve engineering knowledge and competency. The society's Civil Engineering Landmark Program recognizes historically significant civil engineering projects, structures, and sites.

CraneWorks, Inc. sells and rentals cranes and related equipment. Its services include custom fabrication and crane operator certification. The company was founded by David Collis in 2002 and is headquartered in Houston, TX.