1961: Ordained

1961-1963: St. Jane Frances, Hollywood, CA

1963-1965: St. Lawrence Martyr, Redondo Beach, CA

1965-1966: Immaculate Conception, Monrovia, CA

1966-1968: Mission San Juan, Capistrano, CA

1968-1972: Nativity, Torrance, CA

1972: Precious Blood, Los Angeles, CA

1972-1976: St. Anthony of Padua, Gardena, CA

1976-2016: St. Catherine Laboure, Torrance, CA

2016: Died

Notes: At least one survivor has come forward alleging child sexual abuse by Fr. John F. O’Byrne, from approximately 1965 to 1966, while he worked at Immaculate Conception in Monrovia, California. Fr. O’Byrne has been named in at least one civil lawsuit. He was included in the Archdiocese of Los Angeles’ list of priests accused of sexual misconduct involving minors.