Career
Zerey was ordained a priest on 5 May 1967 and started Working at the Patriarchal College School in Cairo in 1967, and in 1972 he was appointed as director of the Patriarchal College School in Heliopolis. At the same time was a patron of the Church of Saint Joseph in First Rate (at Lloyd's) ZaytoonCairo since 1985 to 2001, and president of the second-degree spiritual Court. On 22 June 2001 was appointed titular Archbishop of Damiata and Auxiliary Bishop of Antioch.
He was consecrated bishop on 9 November 2001 by Patriarch Gregory III Laham, assisted by co-consecrators Archbishops Elias Zoghby and Paul Antaki.
On 22 June 2001 Zerey was appointed Patriarchal Vicar of Alexandria and Syncellus for the Melkite Church in Egypt and Sudan. On 4 June 2008 Zerey was appointed Vicar Apostolic of Jerusalem.
During 2010 Zerey was a participant in the Synod of Bishops for the Middle East in Rome.