Mother Théodore was the daughter of Laurent and Isabelle Guérin. She joined the Sisters of Providence at Ruillé-sur-Loir, France on 18 August 1823, taking the name Sister Saint Theodore, and making her final vows on 5 September 1831. She taught in Rennes and Soulaines, France.
Mother Théodore was sent with five other sisters (Sister Olympiade Boyer, Sister Saint Vincent Ferrer Gagé, Sister Basilide Sénéschal, Sister Mary Xavier Lerée and Sister Mary Liguori Tiercin) to the diocese of Vincennes, Indiana, USA on 22 October 1840. They established the Academy of Saint Mary-of-the-Woods on 4 July 1841 at Terre Haute, Indiana, the first Catholic women's liberal-arts college in the United States. She established schools at Jasper, Saint Mary-of-the-Woods Village, Vincennes, Montgomery, Madison, Terre Haute, Fort Wayne, Evansville, North Madison, Lanesville and Columbus, all in Indiana, and Saint Francisville in Illinois.
She founded an orphanage for girls and one for boys in Vincennes, Indiana. She opened pharmacies where medicines were dispensed free to the poor at Vincennes and Saint Mary-of-the-Woods, Indiana. Mother Théodore oversaw construction of a motherhouse for the Sisters of Providence and several additions to the Academy.
Born: October 2, 1798 at Etables-sur-Mer, Brittany, France as Anne-Thérèse Guérin
Died: May 14, 1856 at Saint Mary-of-the-Woods, Indiana, of natural causes; buried at Church of the Immaculate Conception, Saint Mary-of-the-Woods, Indiana, USA
Venerable: July 22, 1992 by Saint John Paul II
Beatified: October 25, 1998 by Saint John Paul II at Saint Peter's Square, Vatican City
Canonized: October 15, 2006 by Pope Benedict XVI