Series I: Research Files consists of Brenman-Gibson's research files for her biography on the American playwright, Clifford Odets entitled, Clifford Odets - American Playwright: The Years from 1906-1940. It contains chronological notebooks, which are basic summaries of Odets' life taken from his own diaries and correspondence, as well as interviews Brenman-Gibson conducted during the course of her research with Odets' family, friends, and acquaintances. Also found in Series I is the correspondence Brenman-Gibson had with various people related to Odets. Additionally, summaries, transcripts, and audio of the interviews are found in Series I. There are her files for grants in which she applied to conduct her research. There is significant material copied from Clifford Odets papers. This includes his diaries, correspondence, and notes. Rough drafts for Volume II of Brenman-Gibson's biography, which she never published, are also in Series I.