Born in Livorno, Italy, of English parents, George Hadfield acquired his architectural training at the Royal Academy in London and with James Wyatt, with whom he was associated for nearly six years. After a professional setback, Hadfield accepted the commission from Washington, DC, to supervise the construction of the Capitol building. From 1795 to 1798 he worked in Washington, DC, resigning briefly during the argument regarding <1>William Thornton1>'s design for the Capitol.
After his discharge in June 1798 Hadfield remained in the Washington area, contributing a number of Classical Revival buildings to the District and its surrounds. In Philadelphia he was involved in the design of the Second Bank of the United States (1824).