<p>
	His studies in conservation biology have been published in numerous scientific journals and books including <em>The Greater Yellowstone Ecosystem: Redefining America&rsquo;s Wilderness Heritage</em> (Yale University Press 1991), <em>The Smithsonian Book of North American Mammals</em> (Smithsonian Institution Press 1999) and <em>Vertebrate Conservation and Biodiversity</em> (Springer 2007). He is the author of <em>Conservation Biology: Foundations, Concepts, Applications</em> (Springer 2008), a textbook used worldwide in conservation education. His contributions toward a theology of Christian environmental stewardship have been featured in numerous magazines and journals including <em>Conservation Biology</em>, <em>Science and Engineering Ethics</em>, <em>Christianity Today</em>, <em>The Evangelical Review of Theology</em>, <em>Perspectives On Science and Christian Faith</em>, and the book, <em>The Best in Theology</em>, edited by J. I. Packer. He is the senior author of the book <em>Redeeming Creation: The Biblical Basis for Environmental Stewardship</em>, published by InterVarsity Press. His most recent work, <em>Between Heaven and Earth</em> (Praeger 2010) traces the expression of biblical principles of creation care throughout the history of the Christian tradition.</p>
