Sister Theresa was born on Oct. 14, 1934, in Milwaukee and was one of three children of Leopold Leon (Pocwiardowski) and Marie Dorothy (Pietruszynski) Peck. She graduated from Notre Dame High School (1952) and St. Mary’s School of Nursing (1955), both in Milwaukee, and entered the Daughters of Charity in St. Louis in 1956.

After initial formation and reception of a bachelor’s of science in nursing from Marillac College, Sister Theresa first served at St. Mary’s Help Hospital in San Francisco, then as nurse supervisor at Hotel Dieu in El Paso, Texas ,and St. Vincent’s Medical Center in Los Angeles. She received an MBA from George Washington University in Washington, D.C., in 1969. Sister Theresa served as assistant administrator at St. Joseph Health Center and Hospital in Chicago and as administrator at Seton Home Health in London, Kentucky; St. Joseph Hospital in Alton, Illinois; St. Mary Medical Center in Evansville, Indiana; and St. Vincent Hospital and Health Services in Indianapolis.

From 1986-93, Sister Theresa served in the roles of president and vice president of Daughters of Charity National Health System (DCNHS) in St. Louis. She served as president and CEO of St. Joseph Health Centers and Hospital and Catholic Health Partners in Chicago.

Sister Theresa served in the roles of provincial councillor, provincial assistant and provincial treasurer at Mater Dei Provincialate and as administrator of the Mater Dei Campus in Evansville. She was an active board member of Mission and Ministry Inc., Visioning for the Mission Steering Committee, Seton Harvest Inc., St. Vincent Early Learning Center and Habitat for Humanity. She served in the ministry of prayer at Seton Residence until her death.

Sister Theresa was preceded in death by her parents and her brother, Leroy Peck. She is survived by her sister, Virginia Adamski, her nieces and nephews and other loving family members, her sisters in community and many friends.

Burial was in St. Joseph Cemetery in Evansville.