TMI Episcopal is a private school in San Antonio. Previously known as Texas Military Institute, TMI is a selective coeducational Episcopal college preparatory school with a military tradition in San Antonio, Texas for boarding and day students. It is the flagship school, and sole secondary school, of the Episcopal Diocese of West Texas. TMI is the oldest Episcopal college preparatory school in the American Southwest. Founded as West Texas School for Boys, the school was later known as West Texas Military Academy, and popularly nicknamed 'West Point on the Rio Grande', though it is several hours from the Rio Grande itself.

James Steptoe Johnston was an American Confederate veteran, preacher and educator. He served as a bishop of the Episcopal Church in the United States of America. He was the last bishop of the missionary district of west Texas and the first bishop of the Diocese of West Texas. He was also the founder of TMI — The Episcopal School of Texas, a private school in San Antonio, Texas.