His Eminence, Metropolitan Demetrius of America, was born Victor Kiriacou on November 15/28, 1974, in Toronto, Canada, to pious parents Constantine (who was tonsured a monk with the name Naoum prior to his repose) and Chrysoula Kiriacou from Vevi, Florina, Greece. He is the third of three children.
 

After spending time in the Holy Land and on Mount Athos, he entered the Monastery of the Holy Transfiguration in 1994 and was tonsured, receiving the name Demetrius (named after his ancestor, the priest Demetrius) in honor of St Demetrius of Thessaloniki. He was ordained to the diaconate in 1999, the priesthood in 2005, and the episcopacy in 2006. In September 2012, he was received into the canonical Church of the Genuine Orthodox Christians of Greece together with a number of clergy, monastics, and parishes throughout the United States, and elected Bishop of Boston, concelebrating with His Beatitude, Archbishop Kallinikos of Athens and all Greece, and those hierarchs with him on September 8/21, 2012. On September 20/October 3, 2012, the feast of St. Eustathios, he was elected Abbot of Holy Ascension Monastery in Bearsville, NY, in the presence of His Beatitude, Archbishop Kallinikos, and five other hierarchs of the Synod from Greece and America. On February 6/19, 2014, he was elected Metropolitan of America.