“Whatever happened to D. O. Teasley?” has been asked since 1921. No definitive answer was known until now. “I am the Lord’s” chronicles his beginnings, rise to prominence and power in the Church of God reformation movement, and downfall from hidden choices. This biography shares his impact on this Holiness movement as an author, hymnwriter, editor, administrator, inventor, and more. A must read for those studying American religious history in the early 20th century. A mystery solved.