Steve Freihon/Related-Oxford
New York, New York
Here's How
We apply scientific and engineering principles to solve the world’s challenges — starting with yours. Whether we’re focusing on the design, construction and performance of buildings or expanding into new disciplines, we never limit ourselves, applying our expertise to all types of projects across a range of industries.
1949
Year Founded
40+
Offices Worldwide
7,000+
Active Projects
150+
Countries Worked In
50+
Languages Spoken
215+
LEED Professionals
What We Do
Whatever issue you face, we have your solution. We get to the heart of every problem—digging deep to understand its intricacies and nuances, so we can help you achieve your goals, together.
Flood Resilience
We go beyond building-code compliance to protect your assets from current and future flood risks.
Venue Concert & Event Rigging
We're the leading industry expert in rigging engineering and structural load evaluation services for touring concerts, shows and special events.
Envelope Renewal
From hands-on investigation and analysis to repair or restoration for any material or building type, we can help you meet all your building enclosure renewal needs.
Deconstruction Engineering
Our 60+ years of experience in design and forensics combines with unequaled expertise in modeling and simulation to reengineer the demolition process.
Hydrogen Engineering
From risk assessment and advanced modelling to energy storage and supply, we work across the hydrogen spectrum to support your structural, safety, regulatory and resilience priorities.
Embodied Carbon
We help you make decisions that reduce the life-cycle impact of building materials on climate change – without compromising performance or cost.
Our Work
We are conquering complex problems - on six continents - and finding better ways to tackle even the most straightforward undertakings.
Courtesy Gensler
Courtesy Gensler
Courtesy Foster + Partners
Thornton Tomasetti
Recent News & Insights
Insight
CFD & Soccer Ball AerodynamicsJune 16, 2026
A curling free kick looks like magic, but it is really fluid dynamics in motion. Our CFD model shows how spin, airflow and the Magnus effect shape the ball’s path.
Insight
GreenBox, an Innovative Mass Timber Floor SystemJune 15, 2026
Hear how GreenBox®, an innovative prefabricated mass timber floor system developed by London-based Associate Harry Crofton, combines speed, performance, sustainability, and reusability for the next generation of timber buildings.
News
ENR Spotlights Rock Island Bridge’s TransformationJune 11, 2026
Engineering News-Record recently featured the Rock Island Bridge Renovation, a Kansas City project that transformed a historic railroad bridge over the Kansas River into a 35,000-square-foot public destination for dining, events and pedestrian connection.
News
FIFA World Cup 2026 Showcase Thornton Tomasetti EngineeringJune 11, 2026
Several FIFA World Cup 2026 host stadiums – including venues in New York/New Jersey, Philadelphia, Toronto, and Miami – feature Thornton Tomasetti engineering expertise.
Insight
Vibration and Acoustics in Mass TimberJune 08, 2026
Mass timber offers major design advantages, but vibration and acoustic performance require careful coordination. Listen how design teams can balance floor vibration, acoustic separation, composite CLT-concrete systems, and sensitive equipment requirements in mass timber buildings.