Assignment Record:
| Dates | Assignment |
|---|---|
| 1966 | Ordained |
| 1967 – 1971 | Christ the King Church, Hudson, MA |
| 1972 | St. Mary’s Church, Quincy, MA |
| 1973 – 1988 | St. Patrick’s Church, Watertown, MA |
| 1989 – 1995 | St. Francis of Assisi Church, Medford, MA |
| 1996 – 2008 | St. George Church, Framingham, MA |
- The Official Catholic Directory, Kenedy & Sons
(The years listed above are the publication years of the Official Catholic Directory. According to the Directory, the assignments provided for a given year are effective as of January 1 of that year. This means that a priest listed in the Directory for a given year at a parish or school was likely at the same assignment for at least part of the previous year as well.)
- Father O’Brien died in 2008.
- Father O’Brien was accused of sexually abusing a male minor child on at least 14 occasions from approximately 1966 to approximately 1971 when the boy was approximately 7 to 12 years old. The sexual abuse took place in property belonging to Christ the King Parish, including in a room in Christ the King Church and a room in the parochial grammar school of Christ of the King Parish.
- The sexual abuse by Father O'Brien included the following: Father O’Brien forcing the boy to perform oral sex on Father O'Brien, and Father O'Brien penetrating the boy’s anus with Father O'Brien's finger.
- The Archdiocese of Boston agreed to settle the claim in 2021.
- Complaint filed by the Law Offices of Mitchell Garabedian (view or download pdf)