Kathrin Cawein was a visual artist who lived most of her life in Pleasantville, New York. This collection includes examples of her artwork, personal correspondence, scrapbooks, photographs and other material illustrating her career and personal life.

Seabury Cone Mastick was a legislator and banker in New York state who later married artist Kathrin Cawein. This collection contains correspondence, photographs, publications, a diploma from Oberlin College, and various legal documents.