The largest in the collection, this series consists primarily of correspondence and interview notes with various people to whom Carr wrote while doing research for her biography of McCullers. Among the many writers, artists, and friends of McCullers that Carr contacted, there are Edward Albee, W.H. Auden, Djuna Barnes, Simone de Beauvoir, Elizabeth Bowen, Salvator Dali, Greta Garbo, Graham Greene, Christopher Isherwood, and Alberto Moravia. While many of the people Carr addressed refused to cooperate with her biography, numerous others offered their assistance, and the series includes significant material from and about David Diamond, Jordan Massee, Edwin Peacock, Mary S. Tucker, and Tennessee Williams. The series is arranged alphabetically by the last name of the correspondent, but is preceded by four folders with general information, including addresses and notes about the people represented in the series.