The papers of painter Henry Mosler (1841-1920), who began his career in Cincinnati, Ohio, lived in Germany and Paris for at least 2 decades, and finally settled in New York, measure 4.8 linear feet and date from 1856-1929. The collection documents Mosler's life and career through biographical material, personal and professional letters from members of the military, museums, family, friends and colleagues, writings including an 1862 Civil War diary, personal business records, printed material, artwork and sketchbooks, and photographs of Mosler, his family, colleagues and artwork.

The papers of modernist painter and activist Harold Weston (1894-1972) date from 1894 to 1978 and measure 24.3 linear feet. The papers focus on Weston's painting career and his involvement with humanitarian and artistic causes. Found are biographical materials, correspondence, personal business records, association and organization records, commission and project files, materials relating to Weston's book Freedom in the Wilds, writings, artwork, printed materials, two scrapbooks, and photographs.

The John Singer Sargent letters consist of 104 letters dating from 1887 to 1922. The letters provide limited insight into his later career through letters to commissioned patrons, sitters, and friends and colleagues. Topics covered include works in progress, replies to social invitations, and other general social news. Many of the letters are written to Mrs. Charles Hunter, an English friend and patron who sat for several portraits. Also found are letters from Sargent to friend Edith Blaney, whose husband was landscape artist Dwight Blaney. Additional scattered letters were written to Henry Mills Alden, Lawrence Barrett, Mrs. Baxter, a Mr. Griffith, Sir George Hunter, Mrs. Jackson, Louisa P. Loring, Henry Gurdon Marquand, Mrs. Pick, Mr. Spizer, and unidentified/illegible recepients. There are two photographs of Sargent.

The Thomas B. Clarke letters from or about Homer Dodge Martin measure 0.2 linear feet and date from 1893-1897. Twenty-two letters from Martin to art collector and patron Thomas B. Clarke, document Martin's work, his financial struggles, and his physical and mental condition in the last 5 years of his life. Additional letters to and from others further illuminate Martin's relationship with Clarke and provide insight into his financial affairs and the increasingly favorable market for the painter's work just prior to and following his death in 1897.

The papers of California and New York painter Ethel Fisher measure 12.5 linear feet and date from 1930 to 2017. Included are biographical materials, correspondence, writings, project files, exhibition files, artists' files, personal business records, printed material, artwork and several sketchbooks, a few sound and video recordings, and photographic material.

The papers of painter, photographer and sculptor Lowell Nesbitt measure 50.2 linear feet and 0.001 GB and date from circa 1903-1993 (bulk 1950-1993). The collection documents Nesbitt's career through biographical material, correspondence, subject files, business and financial records, source material, artwork, photographs and audiovisual records, printed material and scrapbooks.

Dwight William Tryon (1849-1925) was a noted American landscape painter whose painting style is associated with American tonalism. His paintings gained international recognition from the 1880s through the 1920s. Charles Lang Freer was his primary patron. Tryon taught art at Smith College and became head of the Art Department. The Tryon papers, dating from circa 1872 to 1930, document Tryon's professional and personal life and include correspondence, photographs, a sketchbook, and newspaper clippings.

The papers of painter and muralist Alson Skinner Clark measure 7.2 linear feet and date from 1870 to 1971, with the bulk of the material from 1890 to 1940. Clark's career is documented through biographical material; correspondence with family, friends, galleries, and dealers; eleven diaries by the artist as well as 16 by his wife Medora Clark; stories and essays by Medora; financial records and business files of art and civilian concerns; assorted printed material including exhibition catalogs and announcements, maps, news clippings (singly and in scrapbooks), advertisements, and ephemera; and photographs of the artist, his friends and family, studio, travels, and artwork.

The papers of the sculptor Michael Brenner measure 0.4 linear feet and date from 1888 to 1976. The collection includes letters, scrapbooks, drawings, photographs and other materials documenting Michael Brenner's career, the activities of members of the Brenner family, and the colony of expatriate American artists flourishing in Paris in the early twentieth century.

The Walt Kuhn Family papers and Armory Show records measure 31 linear feet and date from 1859 to 1984, with the bulk of material dating from 1900 to 1949. Papers contain records of the legendary Armory Show of 1913, also known as the International Exhibition of Modern Art, which introduced modern European painting and sculpture to the American public. Papers also contain records of the Association of American Painters and Sculptors (AAPS), the artist-run organization that mounted the Armory Show; records of the New York artists' clubs the Kit Kat Club (founded 1881) and the Penguin Club (founded 1917); and the personal and family papers of New York artist Walt Kuhn (1877-1949), one of the primary organizers of the Armory Show.