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 collection consists of papers and other materials covering Gillespie's life as a student, pastor, professor, and administrator. Much of the material includes correspondence and other communications between Gillespie and others. The bulk of the collection spans his presidency at Princeton Theological Seminary.

William McElwee Miller was a Presbyterian missionary and author who served in Persia from 1919 to 1962. This collection consists of the correspondence, works, documents, and memorabilia accumulated over the period of his lifetime from 1899 to 1993 and beyond.