Dr. SINCLAIR FERGUSON (born 1948) is a Scottish theologian known in Reformed Christian circles for his teaching, writing, and editorial work. He is one of the most-respected Reformed theologians in the world today. He earned his M.A., B.D., and Ph.D. from the University of Aberdeen. He taught systematic theology full-time at Westminster Theological Seminary in Philadelphia for many years and continues to teach there as a visiting professor, and teaching fellow for Ligonier Ministries.
Martin Luther (10 November 1483 – 18 February 1546) was a German monk, priest, professor of theology and iconic figure of the Protestant Reformation. He strongly disputed the claim that freedom from God's punishment for sin could be purchased with money. He confronted indulgence salesman Johann Tetzel with his Ninety-Five Theses in 1517. His theology challenged the authority and office of the Pope by teaching that the Bible is the only source of divinely revealed knowledge from God.
John Knox (c. 1514 – 24 November 1572) was a Scottish clergyman and a leader of the Protestant Reformation who brought reformation to the church in Scotland.In Geneva he met John Calvin, from whom he gained experience and knowledge of Reformed theology and Presbyterian polity. On his return to Scotland he led the Protestant Reformation in Scotland.
Paul David Washer (born 1961) is the Founder/Director & Missions Coordinator of HeartCry Missionary Society which supports indigenous missionary work. Washer's sermons tend to have an evangelistic focus on the gospel and the doctrine of the assurance of salvation and predestination, and he frequently speaks against modern church practices such as the sinner's prayer, and a focus on numerical church growth.