1961-65:

Assistant Professor of Biblical Studies at Stonebridge Priory, Lake Bluff, Illinois.
Guest lectureships at: St. Norbert's Abbey, De Pere, Wisconsin (1963-64); Barat College, Lake Forest, Illinois (1963-64); Loyola University, Chicago, Illinois (1964-65); St. Mary's College Graduate School, Notre Dame, Indiana (Summers of 1964 and 1965).

1967-68:

Assistant Professor of Biblical Studies at Mundelein Seminary, Illinois.

1968-69:

Assistant Professor of Biblical Studies at the Catholic Theological Union, Hyde Park, Chicago.

1969-73:

Associate Professor in the Department of Religious Studies, DePaul University, Chicago.

1973-95:

Professor in the Department of Religious Studies, DePaul University, Chicago.

1995-

Emeritus Professor in the Department of Religious Studies, DePaul University, Chicago.

1996 (Fall):

Croghan Bicentennial Visiting Professor of Religion, Williams College, Williamstown, MA.

2006 (Spring)

Distinguished Professor of Religious Studies, University of Central Florida, Orlando , FL