Those familiar with Dorothy Day's life are aware of the crucial role she assigned to Peter Maurin, her mentor and co-founder of the Catholic Worker. It was her meeting with Maurin in 1932 that revealed her vocation, showing her how 'to reconcile body and soul, this world and the next.' And yet the life and thinking of this 'peasant philosopher' remain cloaked in legend. To convey a fuller sense of his story, his unique vision, and personality, Day began this biography of Maurin in the 1940s. Francis Sicius has at last completed her work, thus providing the most complete and intimate portrait of the man Day called 'an Apostle to the world' whose personalist, communitarian, and ecological message offers a healing challenge for our time.