About HNTB

HNTB Corporation is an employee-owned infrastructure solutions firm serving public and private owners and contractors. With more than a century of service, HNTB understands the life cycle of infrastructure and addresses clients’ most complex technical, financial and operational challenges. Professionals deliver a full range of infrastructure-related services, including award-winning planning, design, program and construction management.

Our culture is defined by integrity, technical excellence and providing quality work on time and on budget to our clients’ satisfaction. The ideals and values that have guided HNTB for its first 100 years still hold true today.




HNTB’s roots go as far back as 1887 when Dr. John Alexander Low Waddell opens a consulting practice in Kansas City, Missouri. After working under Waddell, Ernest Emmanuel Howard, the “H” in HNTB, establishes the partnership of Harrington, Howard & Ash, later to become HNTB.


Enoch Needles, later to become the “N” in HNTB, opens the firm’s New York office.


The firm survives the Great Depression with federally funded infrastructure projects, including the Harlem River Bridge and the South Omaha Bridge, managed by the firm’s new chief designer, Ruben Bergendoff, the “B” in HNTB.


Known for his meticulous technical standards, Henry C. Tammen, the “T” in HNTB, becomes a partner.


The firm changes its name to Howard, Needles, Tammen & Bergendoff. HNTB broadens its scope to include highway design and aviation, making it a leader in the transportation industry.


President Eisenhower signs the Federal Aid Highway Act, which created the country’s Interstate Highway System. This legislation was a key driver for HNTB’s further diversification in transportation services.


The firm acquires Henry B. Steeg & Associates, an Indianapolis-based environmental engineering firm, to expand its environmental practice.


With the acquisition of architectural firm Kivett & Myers, HNTB launches one of the most successful national engineering and architecture practices in the country.


The firm acquires the rail firm of Thomas K. Dyer, Inc., adding track signal service communications and traction power systems design services to its portfolio, positioning the firm to serve the rail industry during a period of global expansion.


HNTB wins the American Council of Engineering Companies’ Grand Conceptor Award for its work on the Mount Baker Ridge Tunnel in Seattle. The tunnel’s 63-foot inside diameter made it the largest soft-ground tunnel in the world.


Previously operating as a partnership, Howard, Needles, Tammen & Bergendoff reorganizes under a corporate structure and changes its name to HNTB Corporation.


The firm establishes the HNTB Employee Stock Ownership Plan, enabling employees to share in the value they create.


HNTB celebrates its 100th year of providing infrastructure solutions.