Dr. Frank Horsfall was a microbiologist with the Rockefeller Hospital from 1934 to 1960, after which he became Director of the Sloan-Kettering Institute for Cancer Research until his death in 1971. Collection contains correspondence, diaries, memoranda, drafts of articles, laboratory studies and notes, reprints, printed matter, and photos.

Dr. Hueper was Assistant Director and Pathologist at the Haskell Laboratory, Dupont Company, 1938-1948, and Chief of the Environmental Cancer Section, National Cancer Institute, 1948-1964. He was the author of five books and 350 publications. His work helped establish the conviction that most human cancers are associated with environmental factors.