The Leo Castelli Gallery records measure 215.9 linear feet and 0.001 GB and date from circa 1880-2000, with the bulk of the materials dating from the gallery's founding in 1957 through Leo Castelli's death in 1999. The major influence of dealer Leo Castelli and his gallery on the development of mid-to-late twentieth century modern art in America is well-documented through business and scattered personal correspondence, administrative files, exhibition files, extensive artists' files and printed materials, posters, awards and recognitions, photographs, and sound and video recordings. Also included are records for the subsidiary firms of Castelli Graphics and Castelli/Sonnabend Tapes and Films.

The records of Castelli Graphics measure 45.7 linear feet and date from 1965 to 2001. Administrative files, correspondence, exhibition and project files, artists' files, financial and legal records, inventory and stock records, printed materials, and photographic materials document the activities of the New York art gallery and publishing firm founded by Antoinette Castelli.

The papers of New York art historian, museum director, curator, writer, and educator, Alan R. Solomon, measure 9.9 linear feet and date from 1907-1970, with the bulk of the material dating from 1944-1970. Through biographical material, correspondence, interview transcripts, writings and notes, teaching and study files, subject files, exhibition files, business records, printed material, and photographs, the collection documents Solomon's education, his early teaching appointments at Cornell University, and his subsequent direction of many diverse curatorial and research projects relating to contemporary American art, particularly the transition from Abstract Expressionism to later modern movements, and the thriving New York City art scene.

The papers of curator Nan Rosenthal measure 26.6 linear feet and 17.1 gigabytes and date from circa 1940-2013. There is a small amount of biographical material; correspondence, mostly letters from her first husband Otto Piene; project and research files encompassing her work as a curator and historian; as well as teaching files; and thousands of slides organized by subject. Among Rosenthal's research and project files are sound recordings and transcripts from dozens of interviews Rosenthal conducted with artists including Howard Hodgkin, Anselm Kiefer, friends and family of Yves Klein, Robert Rauschenberg and friends, George Rickey, Claus Oldenburg, and Sangbin Im. In addition to paper records, the collection also includes a large number of sound recordings, video recordings, and born digital material.

The records of the B. R. Kornblatt Gallery of Baltimore, Md. and Washington, D.C. measure 4.1 linear feet and date from 1971 to 1992. The collection consists primarily of artists' files along with a few exhibition files and sales records.

The Robert Scull papers measure 2 linear feet and date from 1955 to circa 1984, with the bulk of the material dating from 1965 to 1970. Throughout the 1960s, Robert Scull was a wealthy and prominent art collector of Abstract, Pop, and Minimalist art whose collection included works by Michael Heizer, Jasper Johns, Robert Rauschenberg, and Andy Warhol, among others. HIs papers include fourteen annotated appointment books, correspondence, financial and legal records, printed material, and photographs.

The records of the Los Angeles Institute of Contemporary Art measure 18 linear feet, date from 1973 to 1988, and document the brief thirteen-year history of LAICA's activities as a Southern California visual arts organization and exhibition space for contemporary art. Records detail the founding of the organization, operations and administration, exhibitions, events, and publications. More than half of the collection is comprised of exhibition, program, and event files that include correspondence with artists, curators, and others; printed materials; and photographs, negatives, and slides.

The papers of San Francisco Beat era photographer, journalist, and poet Mark Green consist of correspondence, biographical information, photographs, Nanny Goat Hill Gallery exhibition announcements, printed materials, and exhibition files for "Rolling Renaissance" (1968) and "A Kind of Beatness: Photographs of a North Beach Era, 1950-1965" (1975) exhibitions that Green helped to organize. Photographs by Mark Green are of notable figures and places in the Beat movement, including Allen Ginsberg, Robert Rauschenberg, and Clyfford Still, as well as photographs by others of Lawrence Ferlinghetti, Mark Green, and Jack Kerouac among others.

The records of the Gertrude Kasle Gallery of Detroit measure 8.1 linear feet and date from 1949-1999, with the bulk of records dating from 1964-1983. The collection documents the establishment and operations of this contemporary American art gallery and consists of artists files, business and administrative files, exhibition files, photographic materials, and interviews and lectures in the form of sound recordings.

The records of the Fendrick Gallery measure 106.4 linear feet and span the years 1952 to 2001. The bulk of the collection is comprised of artist's files that document the gallery's relations with and representation of over 300 contemporary artists and sculptors, including Robert Arneson, William Bailey, Daniel Brush, Wendell Castle, Robert Cottingham, James Drake, John Dreyfuss, Walter Dusenbury, Roger Essley, Helen Frankenthaler , Sam Gilliam, Jasper Johns, Raymond Kaskey, Claude and Francois Lalanne, Albert Paley, Joseph Raffael, Carol Summer, and numerous other artists. Also found are subject, exhibition, commission, administrative, and financial files, as well as files documenting the gallery's relationship with other museums and galleries.