Johnson, Mirmiran & Thompson

Johnson, Mirmiran & Thompson, known in the industry as JMT, is an employee-owned engineering and construction management firm founded in 1971 and headquartered in Sparks, Maryland. It works across transportation, water and wastewater, buildings, energy and environmental markets, with a practice that leans heavily toward public owners: state DOTs, transit agencies, municipal utilities and federal clients. JMT runs construction management and inspection as a core service line rather than an add-on, which is how it landed the $2 million construction management and commissioning contract on GSA’s Mike Mansfield Federal Building seismic retrofit in Butte, Montana. The firm operates dozens of offices along the East Coast and into the Midwest and employs well over a thousand people.

Structure is the thing to understand about JMT. Rather than run every discipline under one label, the firm operates a family of specialised brands beneath the core practice: JMT Technology Group, JMT Architecture, and Clark Nexsen. The stated logic is range – a broader set of services, each with its own depth, supported by the parent firm’s infrastructure backbone.

Employee ownership here is not a line in a values statement. JMT reports advancing to #41 on the National Center for Employee Ownership’s Top 100 list of America’s largest majority employee-owned companies, placing it among the larger ESOP-structured firms in the design sector. On the multi-year schedules that DOT and municipal utility work runs on, that structure tends to show up as lower staff turnover on a client’s project team.

Award recognition in 2026 included Top Project of the Year and six awards in total at the Maryland Quality Initiative ceremony, the state’s transportation industry programme.

The firm’s current emphasis, in its leadership’s own framing, is technology and digital delivery – using modern tools to extend what its architecture, engineering, construction, environmental and technology teams can do. Sustainability and collaboration sit alongside that in how the practice describes its approach to the built environment.

JMT has used the line “Engineering a Brighter Future” since 1971, the year the firm was founded.