The signature on the National Gallery's painting Red Jacket (1958.9.5) is unclear but appears to read "A. Haddock." It is based on a portrait painted by Robert Weir in 1828, which was exhibited at the National Academy of Design and appeared as an engraving in 1829. A scene painter by the name of Haddock worked at the Bowery Theatre in New York from 1827 to 1830, and it is possible that the artists are one and the same. Nothing else is known about the artist. [This is an edited version of the artist's biography published in the NGA Systematic Catalogue]
Chotner, Deborah, with contributions by Julie Aronson, Sarah D. Cash, and Laurie Weitzenkorn. American Naive Paintings. The Collections of the National Gallery of Art Systematic Catalogue. Washington, D.C., 1992: 162-163.