Many years ago, Mariano Detorio began an evangelistic work with the unreached T’boli tribe on the island of Mindanao. At 87 years old, he continues to oversee the ministry, which presently includes 14 churches. He is helping to establish the Sola Gratia Grace Alone International (SGGAI) T’boli School. In addition, Mariano is one of the teachers with the SGGAI Mobile School of Theology, which provides pastors and lay leaders the opportunity for sorely needed theological training without having to leave their local church ministries. To date, more than 50 T’boli men have received training and are providing leadership to their local churches.