Garry Wills is one of the most respected writers on religion. He is the author of Saint Augustine's Childhood, Saint Augustine's Memory, and Saint Augustine's Sin, the first three volumes in this series, as well as the Penguin Lives biography Saint Augustine. His other books include "Negro President": Jefferson and the Slave Power, Why I Am a Catholic, Papal Sin, and Lincoln at Gettysburg, which won the Pulitzer Prize.