He began the Marian Congress in the United States which is held annually Fox was born in Watertown, South Dakota on December 24, 1928.

Fox stated that his "mother put the thought in my mind" of joining the priesthood before the first grade, "She mentioned it only two times in my life, but it stuck.

"[3] He recalled going with her to town when she would buy groceries and that she left him free for an hour and he "would go [to] the Catholic Church and genuflect and spend time before Jesus.

"[3]In his senior year of high school Fox suffered a farm accident with a hay rake that broke his leg.

[2] Fox recalled that "In those days St. John's taught the traditional Catholic faith", and incoming student's were required to take a religious placement exam.

"[3] Despite having no formal religious education, he scored 17th out of 350 incoming college freshman, which he attributed to his frequent reading of the National Catholic Register.

Fox was ordained into the priesthood on April 24, 1955, at the Cathedral of St Joseph for Diocese of Sioux Falls by Bishop William Brady.

He was opposed by both the school board and principal, but received encouragement from Cardinal John Wright, Prefect of the Congregation for the Clergy, who requested six copies of Fox's book.

In 1971 Fox was assigned to St. Bernard Parish in Redfield, South Dakota, where he built a shrine in honor of the Virgin Mary.

I had the overwhelming conviction that Our Lady wanted me to teach the fullness of the Catholic faith to young people wherever I could using the Fatima message as the vehicle in my instruction.

In 1982 with the encouragement of his bishop and the support of Cardinal Francisco Pironio, head of the Congregation for Religious, seven candidates took up residence at the rectory in Redfield.

Fox also create a catechism course called "Sharing the Faith", all while continuing to do his parish work, writing, and Fatima pilgrimages.

In 1985 Fox arrived at St. Mary of Mercy parish in Alexandria, South Dakota, and began building a shrine to Our Lady of Fatima.

Fox gave many conferences on Catholic Mariological teachings at Fatima, and in Australia, Poland, Syria, Mexico, Italy, and the United States.

[2] Among the notables that have spoken at Marian Congresses are Bishop Fabian Bruskewitz, John Corapi, Mother Angelica, Father Harold Cohen and Jeff Cavins.

The Fatima Family Center was built, comprising a gift shop, conference room and storage for Fox's many books.