David R. Cobb

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.

National Society of Professional Engineers operates as a national organization committed to addressing the professional concerns of licensed PEs across all disciplines. The company was founded in 1934 and is headquartered in Alexandria, VA.

Thoroughbred Resources LP provides management and leasing of coal properties and collection of coal production royalties in the Western Kentucky region of the Illinois Basin. The company was founded in 2008 and is headquartered in St. Louis, MO.

Armstrong Energy, Inc. engages in the production of low chlorine, high sulfur thermal coal from the Illinois Basin, with both surface and underground mines. The firm markets its coal primarily to proximate and investment grade electric utility companies as fuel for the steam-powered generators. The company was founded in 2006 and is headquartered in St. Louis, MO.