GSE Systems, Inc. engages in the provision of engineering services, staffing, and simulation software. It operates through the Performance Improvement Solutions and Nuclear Industry Training and Consulting segments. The Performance Improvement Solutions segment includes power plant high-fidelity simulation solutions, technical engineering services for ASME programs, power plant thermal performance optimization, and interactive computer-based tutorials/simulation. The Nuclear Industry Training and Consulting segment focuses on nuclear operations instructors, procedure writers, technical engineers, and other consultants to the nuclear power industry. The company was founded on March 30, 1994 and is headquartered in Columbia, MD.