Antonia Brenner, better known as Mother Antonia , (December 1, 1926 – October 17, 2013) was an American Roman CatholicReligious Sister and activist who chose to reside and care for inmates at the notorious maximum-security La Mesa Prison in Tijuana, Mexico. As a result of her work, she founded a new religious institute called the Eudist Servants of the 11th Hour.