William Strickland was a noted architect and civil engineer in Philadelphia, Pennsylvania, and Nashville, Tennessee. A student of Benjamin Latrobe and mentor to Thomas Ustick Walter, Strickland helped establish the Greek Revival movement in the United States. A pioneering engineer, he wrote a seminal book on railroad construction, helped build several early American railroads, and designed the first ocean breakwater in the Western Hemisphere. He was elected as a member of the American Philosophical Society in 1820.

Benjamin Henry Boneval Latrobe was an Anglo-American neoclassical architect who immigrated to the United States. He was one of the first formally trained, professional architects in the new United States, drawing on influences from his travels in Italy, as well as British and French Neoclassical architects such as Claude Nicolas Ledoux. In his thirties, he immigrated to the new United States and designed the United States Capitol, on "Capitol Hill" in Washington, D.C., as well as the Old Baltimore Cathedral or The Baltimore Basilica,. It is the first Cathedral constructed in the United States for any Christian denomination. Latrobe also designed the largest structure in America at the time, the "Merchants' Exchange" in Baltimore. With extensive balconied atriums through the wings and a large central rotunda under a low dome which dominated the city, it was completed in 1820 after five years of work and endured into the early twentieth century.