Frederick (Friedrich) Neumann was a Jewish philosophy scholar from Austria who converted to Christianity in the 1920s, emigrated to the United States, and became a Congregational minister and visiting professor at Hartford Seminary. Edith Spitzer Neumann was a bacteriologist and microbiologist. This collection consists of his academic and professional papers and records from her successful work to translate and publish his sermons.

The Harry A. Rhodes collection contains his dairies, journals, itineraries, correspondence, mission reports, and sermons from 1898 to 1965. The journals and diaries contain memories, itineraries and records of place, sermon and attendance. The collection has an autobiographical outline of Dr. Rhodes. The collection also includes clippings, photos and photo albums.