History and Theology of Grace
John A, Hardon, SJ received a master's degree in philosophy from Loyola University and a doctorate in theology from the Gregorian University in Rome. He taught at the Jesuit School of Theology at Loyola University in Chicago and the Institute for Advanced Studies in Catholic Doctrine at St. John's University in New York. He organized the Marian Catechists, whose purpose is to promote the solid teaching of the Roman Catholic faith to the laity. He wrote and published more than 50 books, including "Catholic Catechism," "Modern Catholic Dictionary," "Catholic Lifetime Reading Plan," and "With Us Today, on the Real Presence of Jesus Christ in the Eucharist."