[1] Returning to Aleppo, he taught Armenian language and history at the city's Haigazian and Gulbenkian schools until 1946.
He headed the main archive of the Holy See of Cilicia, Lebanon, and was responsible for the official Catholicossate publication Hask between 1947 and 1955.
He also taught Armenological materials at the Lebanese Armenian Hovagimian-Manoukian and Tarouhi Hagopian secondary schools.
He followed a strict non-partisan line in the civil political strife in the life of the Armenian diaspora communities in Lebanon and elsewhere.
Simonian, born in Aintab was the elder son of Ove from Sasun and Manush from Ayntab, was a survivor of the Armenian genocide.