Dougan Clark, M.D., was an American theologian and educator born on May 17, 1828, in Guilford County, North Carolina. He served as a professor of Systematic Theology and Church History at Earlham College in Richmond, Indiana, where he made significant contributions to Christian scholarship. Clark's most notable work is The Theology of Holiness (1893), which delves into the biblical and doctrinal aspects of holiness and sanctification. He explored the importance of spiritual growth and the transformative power of God's grace in the life of a believer. Clark was also known for his involvement in the Holiness Movement, emphasizing practical Christian living and personal holiness. Additionally, he authored The Inner and Outer Life of Holiness and contributed to the theological discussions of his time. His works, grounded in systematic theology, have influenced the understanding of holiness within Christian traditions. Clark passed away in 1896 at the age of 68, leaving behind a legacy of theological exploration and teaching that continues to inspire faith communities today. His influence can be seen in the ongoing discussions about holiness and sanctification in Christian theology.