Bishop Demetrios is the bishop of Mokissos of the Greek Orthodox Metropolis of Chicago

Bishop Demetrios is a spiritual leader of the Greek Orthodox Metropolis of Chicago. He was born to first generation of Greek-American, Christos and Merope Kantzavelos. While growing up he was an active participant in the Assumption Greek Orthodox Community. He received his graduate divinity degree with high distinction from Hellenic College and Holy Cross Greek Orthodox School of Theology in Brookline, Massachusetts, in 1987. Later, he attended Chicago's Loyola University to pursue his post graduate doctoral work in the area of metaphysics.

In October 1989, Bishop Demetrios was ordained to the Diaconate. In 1992, he was ordained to the priesthood, and later in 1995, he was elevated to the rank of Archimandrite by Metropolitan Iakovos of Chicago. Since 1995, he served as an assistant and deacon to the bishop.  On December 9, 2006, Demetrios was consecrated as the Bishop of Mokissos.

Bishop Demetrios established the Bishop's Task Force on AIDS, the first formal Orthodox Christian response to this pandemic in the western hemisphere. He has led many Hellenic organizations and cultural events, and is a regular contributor to publications in local as well as national media channels.