Born in Zgharta, Lebanon, Doueihi was ordained priest on August 14, 1955 to the Maronite Catholic Eparchy of Batroun.
Pope John Paul II named him as the Bishop of Saint Maron of Brooklyn on November 11, 1996.
He was ordained a bishop by Cardinal Nasrallah Boutros Sfeir, Maronite Patriarch of Antioch, on January 11, 1997.
The principal co-consecrators were Bishop Emeritus Francis Zayek of Brooklyn and Archeparch Joseph Mohsen Béchara of Antelias.
Doueihi served as the eparch until his resignation was accepted by Pope John Paul II on January 10, 2004.