[2] He was formerly the auxiliary bishop of Mokissos of the Greek Orthodox Metropolis of Chicago which includes parishes in Illinois, Indiana, Wisconsin, Missouri and Iowa.

A native of Chicago born to first-generation Greek-Americans, Merope (Kossivas) and the late Christ J. Kantzavelos, Demetrios grew up as an active participant in the city's Assumption Greek Orthodox Community.

He went on to attend Hellenic College and Holy Cross Greek Orthodox School of Theology in Brookline, Massachusetts, where he obtained his graduate divinity degree “with high distinction” in 1987.

Demetrios was consecrated as the Bishop of Mokissos on December 9, 2006, following his election to that post by the Holy Synod of the Ecumenical Patriarchate in Phanar, Constantinople, Turkey.

The Council is composed of chief leaders of the Chicago area faith communities and embraces a broad diversity of theological and religious traditions.

He was named Outstanding Community Leader by the Cook County Board of Commissioners in 1995, and received the Jim Noone Award for Religious Leadership from the AIDS Pastoral Care Network in 1997.