Harris Group Inc.

Harris Group Inc. is a privately held, employee-owned multidisciplinary engineering and design consulting firm based in the United States. Founded in 1975 and headquartered in Seattle, Washington, the company operates multiple offices nationwide and employs between 100 and 250 professionals including engineers, designers, and project managers.

Its core activities encompass multi-discipline engineering services such as process, mechanical, piping, electrical, instrumentation, controls, structural, civil, and architectural design. Additional offerings include owner's engineering, independent engineering reviews, automation and system integration, and support for construction, commissioning, and project management.

The firm serves a diverse range of industries including aerospace, chemical and process industries, life sciences, semiconductors and photovoltaics, climate technology, renewable energy and fuels, industrial manufacturing, and commercial/institutional projects. It has built long-term partnerships with major clients, including Fortune 100 companies, emphasizing quality, innovation, and collaborative solutions for complex capital projects.

Harris Group Inc. transitioned to employee ownership via an ESOP in 2007, fostering a culture of shared accountability. In the context of the chemical industry, it has provided original design and engineering services for facilities such as the granular activated carbon (GAC) production line at Arq's Red River Plant in Louisiana, though this involvement has been subject to subsequent litigation regarding design and costs.