Donald R. Horn

GSE Performance Solutions, Inc. develops real-time simulation software, systems and services. The company was founded on April 15, 1988 and is headquartered in Sykesville, MD.

The American Institute of Certified Public Accountants provides vocational education in accounting. The company provides services to the accounting community, regulatory bodies, and other organizations. It also operates in Jersey City, Washington, and Lewisville. It was founded in 1887 and is headquartered in New York City, NY.

Absolute Consulting, Inc. provides technical consulting and staffing solutions. It offers its services to the nuclear energy, fossil generation, renewable energy, oil and gas, and transmission and distribution sectors. The firm's services include procedure writer certification, assessments, consulting, staff augmentation, permanent placement, and project management. The company was founded by Richard D. Linton and Cynthia S. Linton in 1997 and is headquartered in Navarre, FL.

DP Engineering LLC provides engineering solution services for the nuclear power industry. The firm offers its services in the areas like complete design modification package development, calculation preparation and update, emergency diesel generator issues, obsolete 480 volt switchgear and MCC circuit breaker upgrades, inverter and battery charger replacements, valves and actuators (MOV, AOV, SOV). The company was founded by Christopher A. Davenport and Steven L. Pellerin in 1995 and is headquartered in Fort Worth, TX.

Part of GSE Systems, Inc., Hyperspring LLC is a company that provides staff augmentation, training and development services. The company is based in Madison, AL. Hyperspring was acquired by GSE Performance Solutions, Inc. on November 17, 2014 for $11.40 million.