Isaac Thomas Hecker (December 18, 1819 - December 22, 1888) was an American Roman Catholic Priest and founder of the Paulist Fathers, a North American religious society of men; he is named a Servant of God by the Catholic Church. Hecker was originally ordained a Redemptorist priest in 1849. Then, with the blessing of Pope Pius IX, he founded the Missionary Society of St. Paul the Apostle, now known as the Paulist Fathers, in New York on July 7, 1858. The Society was established to evangelize both believers and non-believers in order to convert America to the Catholic Church. Father Hecker sought to evangelize Americans using the popular means of his day, primarily preaching, the public lecture circuit, and the printing press. One of his more enduring publications is The Catholic World, which he created in 1865. Hecker's spirituality centered largely on cultivating the action of the Holy Spirit within the soul as well as the necessity of being attuned to how He prompts one in great and small moments in life. Hecker believed that the Catholic faith and American culture were not opposed, but could be reconciled. The ideas of individual freedom, community, service, and authority were fundamental to Hecker when conceiving of how the Paulists were to be governed and administered. Hecker's work was likened to that of Cardinal John Henry Newman, by the Cardinal himself. Father Hecker's cause for Sainthood was opened January 25, 2008, in the mother Church of the Paulist Fathers on 59th St, New York City.

The life of Fr. Isaac Hecker, with illustrations. Fr. Hecker, founder of the Missionary Society of St. Paul the Apostle, deserves to be counted as the most significant Catholic figure in nineteenth-century America.

Five essays offering analysis of Hecker's thought from the perspectives of church history, political science, theology, and psychology. +

The United States has a long history of religious pluralism, and yet Americans have often thought that people’s faith determines their eternal destinies. The result is that Americans switch religions more often than any other nation. The Chance of Salvation traces the history of the distinctively American idea that religion is a matter of individual choice. Lincoln Mullen shows how the willingness of Americans to change faiths, recorded in narratives that describe a wide variety of conversion experiences, created a shared assumption that religious identity is a decision. In the nineteenth century, as Americans confronted a growing array of religious options, pressures to convert altered the basis of American religion. Evangelical Protestants emphasized conversion as a personal choice, while Protestant missionaries brought Christianity to Native American nations such as the Cherokee, who adopted Christianity on their own terms. Enslaved and freed African Americans similarly created a distinctive form of Christian conversion based on ideas of divine justice and redemption. Mormons proselytized for a new tradition that stressed individual free will. American Jews largely resisted evangelism while at the same time winning converts to Judaism. Converts to Catholicism chose to opt out of the system of religious choice by turning to the authority of the Church. By the early twentieth century, religion in the United States was a system of competing options that created an obligation for more and more Americans to choose their own faith. Religion had changed from a family inheritance to a consciously adopted identity.