The talk by Christiana Peppard is planned at 8 p.m. in the church's Community Room and is free.
It is the last in the parish's First Friday Lecture Series.
A wine and cheese reception will precede the lecture at 7:30 p.m.
An assistant professor of theology and science at Fordham, Peppard holds a bachelor of arts in human biology from Stanford University, a master of arts in ethics from Yale Divinity School and a Ph.D. from Yale University.
With the late Arthur Galston, Peppard co-edited "Expanding Horizons in Bioethics." She now is co-editing with The Rev. Andrea Vicini "Just Sustainability: Technology, Ecology and Resource Extraction."
She has written articles and book chapters on fresh water, theology and science and on ethical methodology.
Peppard has trained as a hospital chaplain and is a lay member of the Board of Directors of "America" magazine, the weekly publication of the Jesuit Conference of the United States.
St. Luke Church is at 49 Turkey Hill Road North.
For more information, call 203-227-7245.