David R. Cobb

Armstrong Energy Inc. is engages in coal mining. The company was founded on 1st September, 2006 and is headquartered in St. Louis, MO.

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.

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.

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.

Professional Engineers & Geoscientists Newfoundland & Labrador operates as an organization whose mandate is regulating these professions in the public interest. It provides licensing and registration, discipline and enforcement, professional development, committees and volunteers, sponsored programs, and publications. The company is headquartered in St. John's, Canada.

Armstrong Coal Co., Inc. produced coal from surface and underground mining operations. The company was founded in 2006 and was headquartered in St. Louis, MO.