Mazen is Senior Pastor of the Jerusalem Alliance Church in the Old City. Mazen came to Christ during a worship service Easter week of 1999. Soon after, he joined the ministry of Campus Crusade for Christ. During that time he was also engaged in the worship ministry of the Alliance Church. One year later he joined as a full time minister in the church in several roles. In 2010, he became the Senior Pastor of Alliance Church. Throughout his ministry, the Lord has used him to teach and train leaders to endorse a heart for the great commission. Under his leadership, the Old City Church has planted a new church in the Beit Sahour area which is considered to be “the biblical shepherd’s field.” Moreover, through different events and activities Mazen is mobilizing the church members to reach out to the majority people group in the Old City.