Alexander Black DD was professor of Exegetical Theology in New College, Edinburgh. Black was a native of Aberdeen, where he received his education, first at the Grammar School, and afterwards at Marischal College. After passing through the Divinity Hall, he was appointed assistant to Dr Ross, East Church, Aberdeen, and he was subsequently presented to the Parish Church of Tarves, as successor to Duncan Mearns. Upon the death of David Brown, Black in 1831 became his successor in the Professorship of Divinity in Marischal College. His knowledge of Hebrew and the cognate tongues procured him, in 1839, a place in a deputation sent by the General Assembly to Palestine. At the disruption, Black attached himself to the Free Church, and in 1844 was appointed to the chair of Exegetical Theology in the New College, Edinburgh, from which he retired in 1856. He was a versatile linguist who, it is said, could converse in nineteen languages and correspond in twelve.

Alexander Keith was a Church of Scotland and Free Church minister, known for his writings on biblical prophecy. Keith interpreted the bible as teaching a premillennial view of Jesus' return and many of his books relate to the place of the Jews and how they relate to Jewish and Christian prophecies in the Bible. Keith, along with Robert Murray M'Cheyne, Andrew Bonar, and Alexander Black visited Palestine on a missionary trip. Taking a faster route home than their other companions Black and Keith passed through Budapest. Keith contracted cholera and nearly died but was influential in setting up a mission to the Jews in Hungary. At the Disruption, Keith sided with the Free Church and continued to minister to a congregation at St Cyrus and to publish works on biblical prophecy.