Carl Brumback (1917–1987)

He was ordained as an Assemby of God minister, and pastored numerous churches. Under the inspiration of the Holy Spirit, he wrote several important books, including "What Meaneth This," which was the first scholarly explanation of speaking in tongues, and that book was used for many years in most of the Pentecostal seminaries. He was commission by the Assemblies of God to research and document the beginning and spread of the modern Pentecostal Movement, which began on Azusu Street in Los Angelos in 1906. That book was titled "Suddenly from Heaven." He wrote "God in Three Persons," which was a theological rebuttal of the Oneness Movement that threatened to bring the Pentecostal Movement into apostasy.