HESM&A - Salas O'Brien Employee Directory

ConstructionGeorgia, United States201-500 Employees

Salas O’Brien, including its HESM&A-Salas O'Brien unit, is a national engineering and facilities design firm based in Atlanta, Georgia. It provides mechanical, electrical, plumbing, and fire-protection design for commercial projects, with a focus on critical environments such as data centers, hospitals, higher education campuses, government facilities, K-12 schools, clean-energy installations, and retail and other commercial facilities. The firm's services emphasize integrated engineering design with licensed professionals, sustainable design for LEED certification, commissioning, and Energy Star certification to support performance, efficiency, and reliability.

It operates across the United States with a footprint of thirteen offices and a broad professional team. Founded in 1989, the firm maintains its base in Atlanta and serves a diverse set of market sectors. In June 2026, Salas O’Brien expanded its collaboration with Siemens, being named a Siemens Digital Industries Solutions partner and a contributor to the Siemens Smart Infrastructure Alliance Program.

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