Charles Tudor Leber was General Secretary of the Board of Foreign Missions of the Presbyterian Church in the U.S.A. The collection contains Leber's correspondence while on tour from 1944-1945 and again in 1953 in Asia, Europe, and Central and South America.

Thomas Samuel Hastings was a Presbyterian pastor of New York City and professor and president of Union Theological Seminary. The collection consists of correspondence, writings, and scrapbooks relating to activities of the seminary and the debate concerning the Presbyterian Creed. Included in the collection are also a notebook of his father, Thomas Hastings (1784-1872), and a travel diary that may be of his son, Thomas Hastings (1860-1920).