About John J. O'Brien
Lived 1919 – 2001 (aged 82). John J. O'Brien was an American civil servant.
John Joseph O'Brien (September 11, 1919 – October 16, 2001) was an American civil servant who investigated the assassination of President John F. Kennedy.
Born in Somerville, Massachusetts, O'Brien received his B.B.A. degree in law and business, cum laude, from Northeastern University, Boston. He received his M.A. degree in the field of governmental administration from George Washington University, Washington, D.C., and in 1941 joined the Bureau of Internal Revenue. After service in the U.S. Coast Guard, O'Brien resumed his work as an Internal Revenue Service investigator. He was appointed as a staff member for the Warren Commission in 1963. Its purpose was to investigate the assassination of Kennedy.
After completion of the Warren Commission, he took the post of assistant chief of the Inspection Services Investigations Branch, in the National Office of Internal Revenue.
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Important facts
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Contemporaries
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Frequently asked questions
Who was John J. O'Brien?
American civil servant (1919-2001)
When was John J. O'Brien born?
John J. O'Brien was born on 11 September 1919 in Somerville.
When did John J. O'Brien die?
John J. O'Brien died on 14 October 2001 in Johnston.
What was John J. O'Brien's occupation?
John J. O'Brien was a civil servant.
What nationality was John J. O'Brien?
John J. O'Brien was American.
Sources & further reading
· DBpedia: John J. O'Brien (civil servant)
Cite this page
APA: Biography.guide. (2026). John J. O'Brien. https://biography.guide/john-j-o-brien/
MLA: "John J. O'Brien." Biography.guide, https://biography.guide/john-j-o-brien/.
Chicago: "John J. O'Brien." Biography.guide. https://biography.guide/john-j-o-brien/.
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