Ammi Phillips (1788-1865) was an itinerant painter who is now placed in the category of "Folk Art" or "Americana". He worked the frontier satisfying a desire for "correct likenesses" (according to one of his advertisements). He was active in western Massachusetts, Connecticut and the Hudson River valley, moving on from a town after demand for likenesses had been met. Along the way he encountered the Van Keuren family, wealthy land-owners in Ulster County since about 1650.

Phillips painted portraits of at least three members of the Van Keuren family:

• Portrait of a Man, Member of the Van Keuren Family, Ammi Phillips, ca 1825-1830, Jonathan and Karin Fielding Collection of the Huntington, http://emuseum.huntington.org/objects/55636/portrait-of-a-man-member-of-the-van-keuren-family
• Portrait of Catharina van Keuren, Ammi Phillips, c. 1825, Collection of Samuel D. and Patricia N. McCullough, https://www.flickr.com/photos/artimageslibrary/5086901692/
• Portrait of a Woman, Member of the Van Keuren Family, Ammi Phillips, ca 1825-1830, Jonathan and Karin Fielding Collection of the Huntington, http://emuseum.huntington.org/objects/55638/portrait-of-a-woman-member-of-the-van-keuren-family

Assuming that Catharina is the daughter of the other two, the dates would be consistent with the portraits depicting Matheus Van Keuren (b. 1751), daughter Catrina (b. 1797), and wife Maria Ekkert (b. 1766), all residents of Kingston, NY. Catrina is the third cousin, six generations removed, of Barbara and June Lardner.