Ayala shows first just what the theory of evolution claims, and the range of questions it can answer. He then turns to the notion of intelligent design, as it is expounded today, and its weaknesses as a scientific or even a theological explanation of the complexity of the universe and all its creatures. Ayala's treatment is especially valuable for its clarity about the respective roles and provinces of science, faith, and theology.
Francisco J. Ayala is University Professor and Donald Bren Professor of Biological Sciences, Ecology and Evolutionary Biology, and Professor of Philosophy, at the University of California, Irvine. Author of dozens of research articles in evolutionary genetics, he is also recipient of dozens of international medals, including the 2001 National Medal of Science.