Sigma Expert Solutions (SES) is owned and operated by Demetrius Siachames, P.E. Demetrius specializes in commercial and government nuclear facility design, analysis, and management.

A graduate of North Carolina State University with a dual degree in Mechanical and Aerospace Engineering, he served as a Nuclear Propulsion Officer in the United States Navy prior to working for over a decade as a consultant at a premier engineering firm. 

His experience includes complex hydraulic analyses, shipboard firefighting evaluations, DOE Program reviews, management of engineering projects, and design of medical devices and radiological ventilation systems. During this time Mr. Siachames gained a reputation for his ability to integrate these diverse experiences to solve complex problems.


Mr. Siachames founded SES to continue providing innovative solutions and project management leadership.