Mid-Atlantic Division President & National Transit/Rail Market Sector Leader
HNTB Corp.
Washington, D.C.
With a master’s degree in urban planning from University of Pennsylvania, Diana Mendes was initially interested in natural resource preservation and urban environments.

Mendes (standing) is committed to ehancing professional development.

With a master’s degree in urban planning from University of Pennsylvania, Diana Mendes was initially interested in natural resource preservation and urban environments. Early on in her career, Mendes worked on a number of large-scale, comprehensive land-use plans for municipalities, counties, and states. This included planning for the expansion of Washington Metropolitan Area Transit Authority’s Metrorail system and one of the first plans in Maryland to save the Chesapeake Bay.
“It was in these early experiences when I had my first ‘transit moment,’” says Mendes. “I really saw how important transit was in impacting the built-in environment and protecting resources.”
Another poignant moment in Mendes’ career was in the aftermath of the September 11 attacks. She was part of a team contracted by the Federal Transit Administration to help rebuild the transit service in lower Manhattan. It was a chance to help the region restore a sense of normalcy.
“That was the first time where I felt like all my work experience over the years was being put to a very important use beyond that which I could do in a normal career,” says Mendes. “Being able to contribute and leave things better than people had hoped for was extremely meaningful.”
ROLE FOCUS. Mendes joined HNTB a little over a year ago. She is focused on managing all of the firm’s Mid-Atlantic transportation business, from Pennsylvania to South Carolina to West Virginia, and everything in between.
“One of the things I get excited about the most is helping people achieve their visions of success,” says Mendes. “We get to work with clients to solve some of their most important and complex problems.”
KEY PROJECT. She is currently engaged in construction management for the extension of the LYNX Blue Line in Charlotte, N.C. The new line is gearing up to open next year — Mendes and her team ensure that the project remains on budget and on time.
“It’s an amazing experience to deliver large-scale transit improvements and help communities be successful from investment in public transportation,” says Mendes. “All while contributing to the betterment of how we live and use our environment.”
INVOLVEMENT. For the last 17 years, Mendes has also been working as an instructor for the National Transit Institute (NTI). NTI is funded by the Federal Transit Administration and is housed at Rutgers University in New Jersey. While NTI offers an array of different courses for affiliates of the transit field, Mendes co-teaches an advanced course in environmental justice.
“It’s an important topic in the times we live in now,” says Mendes. “It’s very gratifying to work with professionals throughout the country to help them think about new ways to address equity during the planning, development, and operation of transit systems.”
Whether it is for clients or other industry professionals, Mendes is committed to enhancing the state of professional development in general. According to Mendes, the biggest problem any manager or leader will face today is attracting and retaining talent as well as promoting workforce development. She views professional development training, such as courses through NTI, as an opportunity to inspire people in the field.
MOTIVATION. Part of Mendes’ industry success can be attributed to her altruistic approach, as she describes her commitment to helping others excel as a motivating principle.
“It helps me do extra research and take on that extra technical training to learn more about the circumstances that our clients are addressing as they try to do a good job serving their communities,” says Mendes.
On her days off, one could find Mendes in a barn. She is a long-time equestrian who started out exchanging farm work for riding lessons at the age of 10. She also enjoys kayaking and is especially partial to trips along the Chesapeake Bay.

See how World Cup matches are generating record transit demand across North America, with ridership surpassing Super Bowls, concerts, and Olympic-era events.
Read More →
In today's transit environment, accurate fuel and mileage data are critical to reducing costs, minimizing downtime, and improving fleet performance.
Read More →
Approved by the Commonwealth Transportation Board, the program supports ongoing infrastructure projects while providing new investments in transit, state of good repair and transportation alternatives.
Read More →
The selected host organization will showcase its transit system, projects, and community while welcoming hundreds of industry leaders and emerging professionals during Hispanic Heritage Month.
Read More →
Backed by motorcoach operators, the legislation seeks to balance emissions goals with passenger safety by allowing limited idling for inspections, accessibility needs and extreme weather conditions.
Read More →
Safety improvements funded through a $25 million federal investment are credited with reducing trespassing and train-vehicle collisions along the Brightline Florida corridor.
Read More →
Weekend rail ridership was especially strong, soaring 18% as riders embraced expanded access to jobs, entertainment, dining, and cultural destinations, said the agency. Total system ridership for May, including bus and rail, was 26,966,657.
Read More →
NYMTC’s quarterly Travel Patterns Report provides a snapshot of travel activity throughout New York City, Long Island, the Lower Hudson Valley, and northern New Jersey using data collected from the agencies operating the region’s bridges, tunnels, and public transit systems.
Read More →
Customers traveling between Redlands and Los Angeles can now tap their preferred payment method, including a credit or debit card, mobile wallet, or wearable device, at station validators before boarding and again while exiting.
Read More →
The budget covers July 1, 2026, through June 30, 2027, a period when pandemic emergency funds run out, the District faces a structural deficit of $375 million, and a regional transit funding measure may appear on the November ballot.
Read More →