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Washington
2001 K Street, NW
Suite 600 North
Washington, DC 20006
United States
Phone: +1.202.580.6300
Fax: +1.202.580.6301
Our Team
Featured Washington Projects
Related Projects
Featured Project
Social Security Administration National Support Center For facilities with a critical mission, security is paramount. With expertise in structural engineering and protective design, we make sure they’re safe.
Featured Project
Capital One Hall Careful design and collaboration brought everything into harmony for this high-end theater and events center.Additional Projects
Washington News
ENR: With Exchange, LIFTbuild Delivering First Top-Down Project in the US Since the '70s
October 28, 2022
When each of the 500-ton, 11,000-sq-ft floorplates are ready to be lifted, they’re raised by eight strand jacks, with a capacity of about 200 tons apiece, staged on the ground with pulley systems at the top.
INWED 2022 – A Conversation with Diana Sagastume
August 23, 2022
To honor women engineers at Thornton Tomasetti, W@TT's Global Programming Committee is sharing stories about remarkable women.
Modern Steel Construction: Center Stage
August 05, 2022
With its striking sawtooth marble and glass façade, sprawling public rooftop park and column-free theater with cantilevered balconies, Capital One Hall puts on a show of its own.
2022 Executive Promotions
August 05, 2022
Congratulations to the following talented individuals as they take on increased responsibilities and new challenges.
INWED 2022 – A Conversation with Colleen Harper
July 07, 2022
To honor women engineers at Thornton Tomasetti, W@TT's Global Programming Committee is sharing stories about remarkable women.
Trust & Partnership: MWBE as It Should Be
June 20, 2022
Our Washington, D.C., office has partnered with small, woman-owned structural firm A+F Engineers on more than 12 projects over 17 years. Representatives of both recently sat down to discuss their experience together.
Exchange Tops Out in Downtown Detroit
May 10, 2022
Exchange Detroit has given “raise the roof” a whole new meaning.
ENR: One Year After US Capitol Riot, Officials and Security Experts Take Stock
January 06, 2022
Senior Principal Peggy Van Eepoel talks about lessons learned and how that information is being used to revise threat, vulnerability and risk assessments for the complex.
ENR: Amazon HQ2 Puts Concrete on an Embodied Carbon Diet
December 23, 2021
"The MetPark team also is doing 'even more' regarding large-scale green buildings, thanks to a ground-breaking focus on sustainability that could become a model for others."
BD&C: Hub For A Company And - Maybe - A City
November 09, 2021
With its mix of uses – three performance spaces, a rooftop park open to the public, conference and classrooms, and balconied atrium – Capital One Hall is a center for corporate use, community arts, education, civic events and more.
Building Bridges: Jen Greenawalt Shapes the Coolest Projects
June 17, 2021
Sometimes getting to shape the coolest projects is itself a cool project, as Washington, D.C., Project Engineer Jennifer Greenawalt learned at an early age.
Abruzzo, Malsch & Van Eepoel Elected to Board of Directors
May 24, 2021
Thornton Tomasetti announces that Managing Principal John Abruzzo, P.E., S.E., and Senior Principals Elisabeth Malsch, Ph.D., P.E., and Peggy Van Eepoel, P.E., F.SEI have been elected to the firm’s board of directors for two-year terms.
2020 Embodied Carbon Showcase: Delivering Resilience to Metropolitan Park
May 09, 2021
As the structural engineer for Metropolitan Park, the first phase of Amazon’s second headquarters, we were tasked with making major reductions in the project’s embodied carbon.
2020 Showcase: Responding to the Pandemic
May 09, 2021
When COVID-19 cases surged in the spring of 2020, and again last winter, our engineers, scientists and programmers lent a hand. Here are a few of the ways we helped our clients and communities meet some immediate challenges.
Newsy: How To Secure The U.S. Capital Without A Fence
February 11, 2021
Senior Principal Peggy Van Eepoel and other security professionals discuss alternative ways to increase physical security at the U.S. Capitol.
AEC Tech Influencers
January 15, 2021
Since 2014, Constructech magazine has been honoring the women behind the digital transformation of the industry and who through their success are creating opportunities for those who will follow them.
17Fifty at Reston Town Center Wins Design Award
October 29, 2020
With its clean and contemporary design, Reston Town Center’s 17FIFTY, the global headquarters of Leidos, has set a new standard for Fairfax County, Virginia.
2019 Green Offices Update
July 27, 2020
In 2019, 87 employees – representing all but our smallest offices – served as local corporate responsibility advocates.
2019 Lifestyle-Friendly Workplace Update
July 26, 2020
In 2019, we continued the regular offerings of our wellness program and added more ways to promote good health.
Supporting the COVID-19 Response Effort
May 11, 2020
As communities around the world battle the coronavirus pandemic, our engineers, scientists and programmers are lending a hand.
Thornton Tomasetti Team Receives American Concrete Institute Design Award
April 28, 2020
Managing Principal Mark J. Tamaro, Senior Engineer Jennifer Greenawalt and Principal Zachary D. Kates have received the American Concrete Institute (ACI) Design Award for their technical paper, “Naked Concrete,” about the innovative structural system of 1900 Reston Metro Plaza in Reston, Virginia.