Darryl K. Horne

Horne Engineering Services LLC provided science, engineering, construction, and technology-assistance services. It also offered public outreach, occupational safety and health, technology integration, business process engineering, acquisition and procurement, environmental sciences, efficiency solutions, energy management, and program engineering services. The company was founded in 1990 and headquartered in Fairfax, VA.

Spectrum Sciences & Software Inc. is an engineering services, management, and manufacturing company dedicated to providing innovative, dependable and cost-effective products and services to a broad range of government customers. Spectrum provides manufacturing, information technology, range operations & maintenance and engineering services to customers who manage programs of National Importance to ensure sound returns on investment for their stockholders.

Horne International, Inc. provides engineering and information technology solutions for a sustainable infrastructure with an emphasis on energy, and the environment. Its services include Complex, Large-Scale Engineering and Environmental Remediation Program Management, Workplace Health and Safety Programs, Technology Applications & Integration, and Business Process Engineering. The company was founded by Darryl K. Horne in August 1998 and is headquartered in Fairfax, VA.

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.