(Formerly Howard, Needles, Tammen & Bergendoff) is an architecture and engineering consulting firm headquartered in Kansas City, Missouri
that has designed many bridges, roadways, airports and professional sports stadiums across the United States and around the world.
The firm started in 1914 as Harrington, Howard & Ash specializing in the design of moveable bridges. In 1941 it changed its name to Howard, Needles, Tammen & Bergendoff. In 1975 it merged with Kivett and Myers to form a sports architecture practice.
It formally changed its name to HNTB Corporation in 1993 and became employee-owned in 2000.
- Greenville Bridge - Greenville, Mississippi and Lake Village, Arkansas
- Charles W. Dean Bridge - Arkansas City, Arkansas and Benoit, Mississippi
- Delaware Memorial Bridge - New Jersey and Delaware
- Fuller Warren Bridge - Jacksonville, Florida
- Hoan Bridge - Milwaukee, Wisconsin
- Bob Kerrey Pedestrian Bridge - Omaha, Nebraska (scheduled to open September 28, 2008)
- South Omaha Veterans Memorial Bridge - Omaha
- Stillwater Lift Bridge - Stillwater, Minnesota
- Leonard P. Zakim Bunker Hill Bridge - Boston, Massachusetts
- Perry Street Bridge - Napoleon, Ohio
- Paseo Bridge - Kansas City, Missouri
- Marquette Interchange - Milwaukee, Wisconsin
- Dallas "High Five" Interchange - Dallas, Texas
- Veterans Glass City Skyway - Toledo, Ohio
- Illinois Tollway - Illinois
- Completion of Interstate 287 - New Jersey
- Three Trails Crossing (formerly the Grandview Triangle) - Kansas City, Missouri
- Kansas Turnpike (I-35, I-335, I-70) - Kansas
- Springfield Interchange (I-95, I-395, I-495, VA 644) - Springfield, Virginia