GSE Systems, Inc. provides professional and technical engineering, staffing services, and simulation software to the power and process industries in the United States, Asia, Europe, and internationally.

It operates in two segments, Performance Improvement Solutions and Workforce Solutions.

The Performance Improvement Solutions segment provides various simulation products, engineering services, and operation training systems for the nuclear, fossil fuel power generation, and process industries.

The Workforce Solutions segment supports project lifecycles and provides specialized and skilled talent for energy and engineering industries, which include reactor operations instructors, procedure writers, project managers, engineers, work management specialists, planners, and training material developers.

It markets its products and services through a network of direct sales staff, agents and representatives, and strategic alliance partners.

The company was founded in 1971 and is headquartered in Columbia, Maryland.