 In 1992 Laham was named Patriarchal Exarch of Jerusalem and in 1998 became Protosyncellus of the same city.Appointed by Patriarch Maximos V as president of the Patriarchal Liturgical Commission, he edited the "Anthologion", the prayer book or breviary of the Melkite Greek Catholic Church and "The Book of the Liturgies", an updated compendium of the Divine Liturgy.As secretary of the Ecumenical Commission of the Melkite Patriarchate, he led the dialogue between the Melkite Greek Catholic and the Antiochian Orthodox Churches.