While in Rome, Ott was ordained a priest by Archbishop Martin O'Connor on December 8, 1951.[4] He earned a doctorate in theology from the Gregorian in 1954.[5] Following his return to Louisiana, he was assigned as a curate at St. Frances Xavier Cabrini Parish[6] in New Orleans, where he remained for three years.[1] He served as an assistant chaplain at the Catholic Student Center of Louisiana State University in Baton Rouge from 1957 to 1961.[5]
Following the death of Sullivan in September 1982, Ott was named the third bishop of the Diocese of Baton Rouge by Pope John Paul II on January 13, 1983.[4] During his nine-year tenure, he encouraged the increased participation of the laity in diocesan affairs, and promoted the ecumenical movement by engaging with leaders of other religions.[5] He also oversaw a major reorganization of the Presbyteral Council and other diocesan structures.[5]
In March 1991, Ott was diagnosed with inoperable liver cancer, which had spread to his spine by October of that year.[7] He eventually lost the use of his legs, and underwent radiation treatment.[7] Stanley Ott died in Baton Rouge in September 1992 at age 65.[1]