Stylianos Stantzios was born of Greek parents in 1969 in Esslingen, Germany. After completing his secondary education, Stylianos enrolled in the Theological School of the Aristotle University of Thessalonica, Greece. Later, he continued his post graduate education at the Pontifical Urbaniana University in Rome, a missionary oriented academic institution.
He was [[tonsure]]d a [[monk]], with the name Gennadios, by [[Metropolitan]] [[Spyridon (Trantellis) of Langada|Spyridon of Langada]] and resided at the Monastery of the [[Holy Trinity]] in Langada for four years. In 1990, Mnk. Gennadios was [[ordination|ordained]] a [[deacon]]. In 1996, Dcn. Gennadios was ordained a [[priest]] and raised to the dignity of [[archimandrite]] on the same day by Metr. [[Prokopios (Tsakoumakas) of Filippoi|Prokopios]] (Tsakoumakas)]] of Philippoi, Neapolis and Thasos (Kavala). Fr. Gennadios served the [[Metropolis of Filippoi, Neapolis and
Thassos|Metropolis of Philippoi]] as [[archdeacon]] and private secretary to Metr. Prokopios and as Preacher, and [[parish]] priest of the Cathedral of St. Paul. He also served in other executive positions of the local Church of Philippoi including responsibilities for Youth and Catechetical Schools, Press, and Public Relations of the [[metropolis]].
After twelve years serving in the Metropolis of Philippoi, he was assigned to the Metropolis of Buenos Aires in Argentina where he served in the Secretariat of the Metropolis. Early in 2004, Fr. Gennadios transferred to the [[Church of Alexandria]] under the jurisdiction of Patriarch [[Petros VII (Papapetrou) of Alexandria|Petros VII]] of Alexandria to a position in Port Elizabeth in the [[Archdiocese of the Cape of Good Hope]]. Later he received an assignment in the Patriarchal Registry Office in Alexandria and a subsequent assignment as the temporary [[chancellor]] of the [[Holy Synod]] following the crash in which Patr. Petros and many of his staff were killed on [[September 11]], 2004. After the election of Archbishop [[Theodoros II (Choreftakis) of Alexandria|Theodoros]] as Patriarch, Fr. Gennadios was appointed chancellor of the Holy Synod and Dean of the [[Cathedral]] of the Annunciation in Alexandria.