Mackenzie was a Philadelphia merchant and book collector whose library of over 7,000 volumes came to the Loganian Library and the Library Company., Painting is signed “J. Neagle, 1829.”, LCP Minutes vol. 5, Nov. 5, 1828, p. 244: "Mess. Norris and Gibson were authorized to contract with any artist whom they may select to paint a portrait of the late William Mackenzie Esquire to correspond with the portrait of the late Dr. Preston by West." Vol. 5, Dec. 4, 1828, p. 246: "Mr. Norris from the Committee appointed for that purpose reported that they had contracted with Mr. Neagle to paint a portrait of the late Mr. Mackenzie Esq. under the authority conferred upon them at the last meeting and that the work had begun." Vol. 5, Aug. 6, 1829, p. 264: “An order was drawn in favour of Joseph Parker Norris for ninety seven dollars for the payment of John Neagle’s bill for painting a portrait of the late William Mackenzie and causing the same to be framed and put up in the room.”, Receipt from John Neagle for the portrait, July 1, 1829. LCP Records, 1829 [7446.F.14]., Commissioned by the Library Company, 1829.
