Syska Hennessy is a global consulting, engineering and commissioning firm for the built environment.

The firm has over 500 employees with 20 offices worldwide, including 18 U.S. locations as well as Shanghai, China, and Dubai, UAE.

[2] Consulting-Specifying Engineer magazine placed Syska Hennessy 19th overall in its 2022 MEP Giants list,[3] with gross revenue over $110 million.

More than 90% of its revenue is derived from mechanical, electrical, and plumbing engineering services, according to the CSE ranking report, Building Design + Construction magazine ranked Syska Hennessy15th in its 2022 list of top building engineering firms.

Originally established in New York City as Syska & Hennessy Engineers, the firm was among the earliest to specialize in the mechanical and electrical systems at the heart of high-rise structures.