Thomas Keating, O.C.S.O. (March 7, 1923 – October 25, 2018) was an American Catholic monk and priest of the Order of Cistercians of the Strict Observance (also known as Trappists). Keating was known as one of the principal developers of Centering Prayer, a contemporary method of contemplative prayer that emerged from St. Joseph's Abbey, Spencer, Massachusetts. Fr. Keating was an internationally renowned theologian and an accomplished author. He traveled the world to speak with laypeople and communities about contemplative Christian practices and the psychology of the spiritual journey. He helped found the Snowmass Interreligious Conference, which had its first meeting in the fall of 1983 and continued meeting annually.