Curtis Johnson is the Robert B. Pamplin Jr. Professor of Government at Lewis & Clark College in Portland, Oregon. He is the author of Aristotle's Theory of the State (Macmillan, 1990) and Socrates and the Immoralists (Rowman and Littlefield, 2005). He has published many articles and chapters on Plato, Aristotle, Darwin, and the history of science. His interest in Darwinian thought originated in his study of Aristotle's biological works.