William Thornton (1759-1828)
Born in the British West Indies, he became an American citizen in 1787. While his design for the Capitol won him praise from the President (as well as $500 and a building lot in the city), the professional architects employed to oversee the construction were less impressed and tried to alter his design at every turn.
Stephen Hallet (1755-1825)
A professionally trained architect from France, he arrived in the U.S. around 1790 and submitted
at least five designs of his own for the Capitol building. Placed in charge of the construction process in 1793, Hallet revised the floor plan of the two wings before being dismissed a year later for insubordination.
George Hadfield (1763-1826)
Hadfield took over from Hallet and immediately suggested major alterations to the original plan. Before his dismissal in 1798, he designed the first office buildings for the cabinet departments.
James Hoban (1758-1831)
Born in Ireland, he had moved to the U.S. in 1785 after studying architecture in Dublin. Hoban supervised the completion of the north wing and designed its interior, while also overseeing
the building of the White House.
Thomas U. Walter (1804-1887)
Walter carried out the expansion of the building in 1850 and replaced the 1818 dome with the one we see today.
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