Nathan C. Wyeth
The firm that designed the building, the Allied Architects, was comprised of architects who had banded together to improve business prospects during the Great Depression. Among the four principals, Nathan C. Wyeth, is best remembered today. In his early career he had worked for the Carrere & Hastings firm, the Superintendent of the Capitol, and the Supervising Architect of the Treasury. In private practice he had designed the first Oval Office for President William Howard Taft.
Although it is difficult to distinguish individual contributions, much of the quality seen in the details of the Longworth Building should perhaps be credited to Wyeth. It is also interesting to note that its Ionic portico was inspired by a similar feature on Washington's old city hall by George Hadfield (1820), and is an early and important example of architects looking to early American buildings for inspiration.