In 1980, Piper became pastor of Bethlehem Baptist Church in Minneapolis, Minnesota, where he ministered until March 31 2013. Piper became involved in evangelical Christianity following the publication of his book "Desiring God: Meditations of a Christian Hedonist" in 1986, and has continued to publish dozens of books further articulating his theological perspective. In 1994, Piper founded Desiring God Ministries, with the aim of "spread a passion for the supremacy of God in all things for the joy of all peoples through Jesus Christ". Desiring God Ministries offers all of Piper's sermons and articles from the past three decades—and most of his books—online at no cost.