Edwin Litchfield Turnbull (1872-1927) was a musician who helped create both the Johns Hopkins University and the Baltimore Symphony Orchestra. The collection spans the years 1881-1971 and consists of approximately 400 letters, photographs, loose newspaper clippings, juvenile notebooks, and 13 scrapbooks of newspaper clippings relating to musical, social, or other events.

Samuel Ottmar Mast (1871-1947) was a biologist and zoologist at Johns Hopkins University. The collection consists of correspondence, administrative information related to running an academic department, and reprints of articles. The collection materials range in date from 1912 to 1947.

Thomas S. Cullen was a graduate of and professor at the Johns Hopkins School of Medicine in the early 20th century. This collection consists of three letters of Thomas S. Cullen to members of the Johns Hopkins administration written in 1926, 1945, and 1949.