This series, which comprises the majority of the collection, consists of Joseph Frank's personal and professional correspondence with various writers, academics, poets, friends, and family members from the 1940s through the early 2000s but primarily from the 1950s through the 1980s. Most correspondence is incoming, though occasional files also contain outgoing correspondence from Joseph Frank and his wife, Marguerite Straus Frank. A small group of family correspondence between members of Frank's family is also included following the alphabetical correspondence, including condolence letters addressed to Marguerite Straus Frank following Joseph Frank's death. Of note is a significant group of letters to Joseph Frank from poet Elizabeth Bishop from the 1950s and early 1960s describing her writing and her experiences while living in Brazil with her partner Lota de Macedo Soares. Correspondence files from poets Yves Bonnefoy and Allen Tate are also sizable. While most of Frank's correspondence is in English, a significant amount is also in French, with smaller quantities in German and Russian.