High Quality Content by WIKIPEDIA articles! TMI ? The Episcopal School of Texas is a coeducational Episcopal college preparatory school in San Antonio, Texas, USA for boarding and day students. It is the flagship school, and sole secondary school, of the Episcopal Diocese of West Texas. Founded as in 1893 by the Rt. Rev'd James Steptoe Johnston, D.D, first Bishop of the Episcopal Diocese of West Texas, TMI is the oldest Episcopal secondary school and one of the oldest boarding schools in the Southwestern United States. Bishop Johnston founded the school as "West Texas School for Boys," but that name was almost immediately changed to West Texas Military Academy.