He was involved in the relocation of Yoruba recaptives to their homeland where the CMS was to set up missions at Abeokuta and Ibadan.
[1] Graf first trained at the Basel Mission before coming to England.
He was ordained as a deacon by James Henry Monk, the Bishop of Gloucester on 5 June 1836.
[1] In 1837 he went Islington to finish his training at the Church Missionary College.
[1] He then returned to Sierra Leone, where he took over Saint Thomas Church, Hastings from John Fredrick Schön, whose wife had recently died.