Gerhard Albert Baum (1923–2017), better known as Gregory Baum, was a German-born Canadian priest and theologian in the Roman Catholic Church. He became known in North America and Europe in the 1960s for his work on ecumenism, interfaith dialogue, and the relationship between the Catholic Church and Jews. In the later 1960s, he went to the New School for Social Theory in New York and became a sociologist, which led to his work on creating a dialogue between classical sociology (Marx, Tocqueville, Durkheim, Toennies, Weber, etc.) and Christian theology. In the 1970s, he welcomed the insights of the Theology of Liberation that came from Latin America and other societies. He also became interested in the work of Karl Mannheim and developed a program of ideology critique that he hoped would eliminate the ideological elements in religion, especially those elements that preached contempt for others and allowed Christians to remain unmoved by the suffering of the victims of social injustice and structural violence. In the 1980s and 1990s, Baum continued his study into ideology critique by integrating the work of the Frankfurt School of Critical Theory. He connected the Frankfurt School's concept of "the end of innocent critique" with the Catholic Church's "preferential option for the poor". Both concepts extended his interest in ideology critique. Since Baum has always been interested in social ethics, he also studied the work of Karl Polanyi, with whom he sympathized greatly.

Avery Robert Dulles, S.J. (1918-2008) was a Jesuit priest, theologian, cardinal of the Roman Catholic Church and served as the Laurence J. McGinley Professor of Religion and Society at Fordham University from 1988 to 2008. He was an internationally known author and lecturer. Dulles was born in Auburn, New York, the son of future U.S. Secretary of State John Foster Dulles (for whom Washington Dulles International Airport is named) and Janet Pomeroy Avery Dulles. His uncle was Director of Central Intelligence Allen Welsh Dulles. Both his great-grandfather John W. Foster and great-uncle Robert Lansing also served as U.S. Secretary of State. He received his primary school education in New York City at the St. Bernard's School and attended secondary schools in Switzerland and The Choate School (now Choate Rosemary Hall) in Wallingford, Connecticut. Dulles was raised a Presbyterian but had become an agnostic by the time he began college at Harvard in 1936. His religious doubts were diminished during a personally profound moment when he stepped out into a rainy day and saw a tree beginning to flower along the Charles River; after that moment he never again "doubted the existence of an all-good and omnipotent God." He noted how his theism turned toward conversion to Catholicism: "The more I examined, the more I was impressed with the consistency and sublimity of Catholic doctrine." He converted to Catholicism in the fall of 1940. After graduating from Harvard College in 1940, he spent a year and a half in Harvard Law School, where he also founded the "St. Benedict Center" (which would become well-known due to the controversial Fr. Leonard Feeney S.J.), before serving in the United States Navy, emerging with the rank of Lieutenant. For his liaison work with the French Navy, he was awarded the French Croix de guerre.

John Paul Meier is a Biblical scholar and Catholic priest. He attended St. Joseph's Seminary and College (B.A., 1964), Gregorian University [Rome] (S.T.L, 1968), and the Biblical Institute [Rome] (S.S.D., 1976). Meier is the author of nine books and more than 60 scholarly articles. He was editor of The Catholic Biblical Quarterly and president of the Catholic Biblical Association. Meier is Professor of New Testament in the Department of Theology at the University of Notre Dame. Before coming to Notre Dame, he was Professor at The Catholic University of America.

Librarian Note: There are many authors with the name John O'Brien. This profile contains various authors. See below for disambiguated authors. John 2^ O'Brien : Author of Leaving Las Vegas John 3^ O'Brien : Children's Book Author & Illustrator John 4^ O'Brien : Pseudonym of Patrick Joseph Hartigan, Poet John 5^ O'Brien : Pioneer of Person Centered Planning John 6^ O'Brien : Co-Founder and Editor of Review of Contemporary Fiction John 7^ O'Brien : GR Author, Horror, Post Apocalyptic, Science Fiction John 8^ O'Brien : GR Author, Environment John 9^ O'Brien : John O'Brien OFM, GR Author, Religion, Christian John 10^ O'Brien : Biography, author of At Home in the Heart of Appalachia John 11^ O'Brien : Business, Investment John 12^ O'Brien : Crime John 13^ O'Brien John 14^ O'Brien John 15^ O'Brien: New Zealand children's book author