St. Theodore (Anne-Therese) Guerin was born October 2, 1798, in Etables, France. She entered the Sisters of Providence of Ruille-sur-Loir in 1823. Mother Theodore educated children and cared for the sick poor in France for 17 years.
In 1840, in response to a request from the bishop of Vincennes, Indiana, Mother Theodore led a group of five Sisters of Providence to the United States to establish a motherhouse and novitiate, to educate children of pioneer families and to care for the sick poor.
Mother Theodore and her companion sisters arrived in the remote forest wilderness of Saint Mary-of-the-Woods, Indiana, the evening of October 22, 1840.