Salas O'Brien is an employee-owned engineering and technical services firm founded in 1975. The company operates with over 5,000 team members across North America, providing comprehensive engineering and consulting services for the built environment. It ranks #31 on the Engineering News-Record Top 500 Design Firms list and #5 among the top 100 MEP firms in North America.
The firm's technical domains include MEP/FP engineering, structural design, civil engineering, sustainability consulting, digital automation, robotics, and forensic consulting. These capabilities serve a range of industry verticals such as healthcare, data centers, aerospace, education, process manufacturing, and government projects.
Approximately 90% of Salas O'Brien's team members are employee-owners. The company reports a team member retention rate of 92% and has achieved 900% revenue growth since 2015.






