Bernard Joseph Francis Lonergan (17 December 1904 – 26 November 1984) was a Canadian Jesuit priest, philosopher, and theologian, regarded by many as one of the most important thinkers of the 20th century.Lonergan's works include Insight: A Study of Human Understanding (1957) and Method in Theology (1972), as well as two studies of Thomas Aquinas, several theological textbooks, and numerous essays, including two posthumously published essays on macroeconomics. A projected 25-volume Collected Works is underway with the University of Toronto Press. He held appointments at the Pontifical Gregorian University, Regis College, Toronto, as Distinguished Visiting Professor at Boston College, and as Stillman Professor of Divinity at Harvard University.