Leonardo Boff spent more than thirty years as a Franciscan, including 22 years as a professor at the Franciscan Institute of Petropolis in Rio de Janeiro, Brazil. Since leaving the Franciscan order and the priesthood in 1992, he has served as professor of ethics at the University of Rio de Janeiro. He has written more than eighty books, including Jesus Christ Liberator, Christianity in a Nutshell, and Francis of Rome, Francis of Assisi (all available from Orbis).