The bulk of the materials pertain to Lawrence LeShan's life and career and date from 1916 to 2017. This includes an address book and notebooks; correspondence with among others James S. McDonnell, Henry Margenau, Gertrude Schmeidler, and his family; papers and drafts by LeShan and others; conference programs; articles about him; a lapel pin dedicated to him by Klaus Lederer; his license to practice as a psychologist (New York State, 1959, 1963, 1983, 2003); a manuscript of "The Miracle of Existence" sent to him by Henry Margenau; his parents' marriage license (1916), his and Ada Nicolescu's marriage license (2007); photographs; and his professional and personal writing projects.

A portion of these papers relate to life and career of his wife, Eda Grossman LeShan. These materials, which date from 1947, and then from 1988-2003, include drafts of her writings including "A Gift of Time" and "The Lobster Reef," correspondence, photographs, a newspaper clipping (1947), and her obituary and memorial service printed program.

Additionally, the papers contain promotional postcards for Ada Nicolescu's books, Prelude in Black and Green (2009) and Four Hundred Bones: Stalin's Teeth in Academia (2015).