Leo L. van Sambeek

RE/SPEC, Inc. engages in the provision of technical and environmental consulting services. Its products include billing and revenue management, health and human services, modeling and optimization, data management, mining software, and monitoring and instrumentation. The company was founded in 1969 and is headquartered in Rapid City, SD.

Society of Mining Engineers represents all professions serving the mining, minerals and underground construction industries. Its memebers include engineers, geologists, metallurgists, educators, students and researchers. The company was founded in 1871 and is headquartered in Wapwallopen, PA.

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.

Part of ACNR Holdings, Inc., Murray American Energy, Inc. undertakes in underground bituminous coal mining. The company is based in Pittsburgh, PA. Murray American Energy was acquired by Murray Energy Corp. from CNX Resources Corp. on December 05, 2013 for $1,034 million.