George Simpson Sr. (1759–1822)
George Simpson was born in Philadelphia on 12 December 1759. Following service in the Revolutionary War, he went into banking, serving as cashier of the Bank of the United States from 1795 to 1812. Simpson also raised money to help finance American efforts in the War of 1812. Among his five children with Eleanor Day (m. 1782, d. 1836) was Stephen Simpson, who would become a prominent writer. George Simpson Sr. died in Philadelphia on 30 November 1822.
"From James Madison to George Simpson, 26 August 1802," Founders Online, National Archives, https://founders.archives.gov/documents/Madison/02-03-02-0659. [Original source: The Papers of James Madison, Secretary of State Series, vol. 3, 1 March–6 October 1802, ed. David B. Mattern, J. C. A. Stagg, Jeanne Kerr Cross, and Susan Holbrook Perdue. Charlottesville: University Press of Virginia, 1995, p. 521.]
Henry Simpson, The Lives of Eminent Philadelphians, Now Deceased (Philadelphia: William Brotherhead, 1859), 890–93.
George Simpson in U.S., Presbyterian Church Records, 1701–1970 (Ancestry.com).
George Simpson Sr. at Find a Grave.
George Simpson at Family Search.