In 1978, he graduated from the St. John of Damascus Institute of Theology, University of Balamand, with a Bachelor in Theology. In 1983 he earned with High Honor his doctoral degree in Liturgics from the University of Thessaloniki, Greece. The tile of his Thesis published in Greek is: “The Service of Holy Baptism: An Historical, Theological, and Liturgical Study.” In 1981, and simultaneously with his doctoral studies, His Eminence successfully earned a Diploma in Byzantine Music issued by the Conservatory of Byzantine Music in Thessaloniki, Greece. His Eminence Metropolitan John Mansour of Lattakia ordained John Yazigi a deacon in 1979 and a priest in 1983, to serve in the Archdiocese of Lattakia.
Since 1981, he taught the courses on Liturgics at the St. John of Damascus Institute of Theology at Balamand. During the periods of 1988-1991 and 2001-2005 he served as the Dean of the Institute of Theology.
In addition, he was appointed Abbot of St. George Al Humayrah Patriarchal Monastery, Syria, in the period of 1993- 2005 where His Eminence founded a monastic community and a school of ecclesiastic studies. His Eminence also became the Abbot of the Our Lady of Balamand Patriarchal Monastery, Lebanon, in the years 2001-2005. Presently, Patriarch John is the spiritual father of the Convent of our Lady of Blemmana in Tartous, Syria.
In 1995, the Holy Synod of Antioch elected him as the Bishop of Pyrgou, an area called in Arabic Wadi An-Nasara or Al-Hosn. He served the parishes there till 2008, when was elected Metropolitan of Western and Central Europe. In addition to his pastoral care in these parishes, His Eminence was involved in many worldwide activities at the ecumenical, Christian and especially Orthodox Christian spheres. Metropolitan John participated in many international conferences, namely in Greece, Italy, Switzerland, Cyprus, United States of America, Russia, and the United Kingdom. His Beautitude is the author of several books on Theology, education, music, and liturgy. He published a series on liturgical studies. He edited the liturgical books of the Orthodox Church in Arabic, and more specifically the liturgical books of the Archbishops, priests, deacons. In addition, he translated and wrote many articles, and gave many lectures in different universities, parishes and institutes.
Published Books: •The Service of Baptism: A Historic, Theological and Liturgical Study, Thessalonica, 1983 [Greek] (in fulfillment of the PHD Thesis Requirements). •Principles of Byzantine Music, Balamand, 1990, Second Edition 2001. •The Life of St. Nectarios the Wonderworker, Lattakya, 1990. •Priesthood & Marriage of Priests, Lattakya, 1992 •Baptism as a Sacrament of Initiation into the life in Christ, Lattakya, 1992. •The Liturgikon, St. George Al-Humayrah Patriarchal Monastery, 2001, Second edition 2005. •The Divine Liturgy of St. John Chrysotom, Al-Humayrah Patriarchal Monastery, 2001 •The Prayers Before and After Holy Communion, St. George Al-Humayrah Patriarchal Monastery, 2003 •The Presanctified Liturgy, Al-Humayrah Patriarchal Monastery, 2001 •Introduction to the Liturgical Families and Rites (English) St. John of Damascus Institute of Theology, 2003. •Introduction to the Liturgical Families and Rites (Arabic) St. John of Damascus Institute of Theology, 2003 •The Service of Matrimony: Past and Present, St. John of Damascus Institute of Theology, 2003. • The Praklesis Service, Balamand Patriarchal Monastery, 2004 •Liturgical Guide in services and Prayers. St. John of Damascus Institute of Theology, University of Balamand, 2005. •Liturgical Sources, St. John of Damascus Institute of Theology, University of Balamand, 2005 •Church Praises, The Diocese of Pyrgou, 2006. •Divine Worship,The Diocese of Pyrgou, 2007. •The Service of the Diaconate, Blemana Convent, 2007. •The Service of the Archbishops, The Diocese of Pyrgou, 2007.
TRANSLATIONS: •The life of Our Holy Righteous Mother Makrina, by St. Gregory of Nyssa, An-Nour Publications, 1984. • For Those Who Believe in Justification by Works, by St. Mark the Monk, in Chapters in Prayers and Spiritual Life, An-Nour, 1990.