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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.

Thornton Tomasetti
1949 Year Founded

40+ Offices Worldwide
90,000+ 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
Courtesy Gensler
Thornton Tomasetti

Recent News & Insight

How Hail Affects Roofing Materials
October 30, 2025
Hailstorms cause billions of dollars' worth of damage to roofing systems, with materials like shingles, metal, tile and solar panels facing risks like cracking or denting. Our hailstorm damage forensics team uses advanced tools to assess damage and recommend resilient materials and prompt inspections for effective repairs and insurance claims.

Ryan Field Tops Out
October 23, 2025
The new Ryan Field tops out in Evanston, Illinois, advancing accessible, sustainable and community-centered design for next-generation collegiate venues.