Machado de Assis (1839-1908) is Brazil's greatest writer and the most important Latin American writer of the nineteenth century. His subtle criticism of cherished institutions is evident to all readers, and critics have often mentioned his skepticism. In Machado de Assis, the Brazilian Pyrrhonian, however, a philosopher seriously examines Machado's philosophical position for the first time. Jose' Raimundo Maia Neto traces Machado's particular brand of skepticism to that of the ancient philosopher Pyrrho of Elis and reveals the sources through which he inherited that line of thought. He then shows how Machado's own philosophical development follows the stages proposed by Pyrrho for the development of a skeptical worldview.