The collection consists of the Harold Ober Associates author files (1927-2002), organizational date books (1950-2017), financial and account ledgers (1935-2010), and files of the agency's three London affiliates: David Higham Associates (1965-1972), Bolt & Watson Limited (1971-1972), and Hughes Massie Limited (1968-1972).

The Harold Ober Associates author files contain correspondence with clients and with editors, publishers, and other agents concerning clients' work. Also included are occasional manuscripts of stories or poems, chapter outlines of novels, and revisions/insertions for clients' work, as well as copies of some contracts. The files of the London affiliate agencies generally contain inter-agency correspondence about clients' work, although letters directly from the authors frequently appear.

Authors with major files in the records include Richard Adams, William Barrett, Catherine Drinker Bowen, Pearl Buck, Walter Edmonds, John Gunther, Langston Hughes, John Bartlow Martin, Muriel Spark, and Philip Wylie. Literary estate correspondence for F. Scott Fitzgerald and William Faulkner is also sizable.