SOME WORKS
- A New Systematic Theology of the Christian Faith
- The Challenge for Africa
- Indian Captive: The Story of Mary Jemison
- The Boilerplate Rhino: Nature in the Eye of the Beholder
- Monster of God: The Man-Eating Predator in the Jungles of History and the Mind
- The Flight of the Iguana: A Sidelong View of Science and Nature
- The Reluctant Mr. Darwin: An Intimate Portrait of Charles Darwin and the Making of His Theory of Evolution
- Wild Thoughts from Wild Places
- The Devil's Prayer
- Poems, Prayers and Promises: The Art and Soul of John Denver