Scope and Content The John A. Mackay Manuscript Collection consists of the personal papers of Princeton Theological Seminary’s third president and contains a variety of materials from throughout his life. The John A. Mackay Collection Accrual, Series XI, was accessioned after the initial John A. Mackay Collection was processed and now stands as that collection’s eleventh series. Content is divided into seven subseries: Writings by John A. Mackay; Personal and Biographical; Latin American Years...