Missiology is Clay's area of specialty. He earned a DMin in Missiology at RTS in 1986, and his PhD is in the Theology and worldwide expansion of Presbyterianism. Missiology is the study of the cross-cultural MISSION of the Church of Jesus Christ. The LORD, the Creator of all Mankind, gave this mission to us: "Go ye into all the world" with this Good News! It is not merely organizational expansion -- it is ESSENTIAL to who we are and what EVERY Christian should be doing until Jesus returns.