# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/philadelphia-jack-o-brien
# Generated: 2026-08-14T23:11:01.875Z

schema: https://schema.org/Person
url: "https://fame.am/person/philadelphia-jack-o-brien"
name: "Philadelphia Jack O'Brien"
slug: "philadelphia-jack-o-brien"
description: "Joseph Francis Hagan was an American world light heavyweight boxing champion in 1905 when he defeated Bob Fitzsimmons for the universal world title. Rather than defending his title, O'Brien instead abandoned it in order to fight at heavyweight. Nat Fleischer, founder and editor of The Ring Magazine, ranked O'Brien as the No. 2 All-Time Light Heavyweight, and famed boxing promoter Charley Rose ranked him as the No. 3 All-Time Light Heavyweight."
tagline: "American boxer (1878–1942)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Jack_O'Brien_2163722564_a888db2f15_o.jpg?width=1200"
gender: "male"
country:
  name: "United States"
  isoCode: "US"
category:
  name: "Athletes"
  slug: "athletes"
profileType:
  name: "Athlete"
  slug: "athlete"
  entityType: "https://www.wikidata.org/entity/Q2066131"
birthDate: "1878-01-17"
deathDate: "1942-11-12"
livingStatus: "DECEASED"
scores:
  popularity:           45.06
  momentum:             1.193878939897723
  historical:           8.958677333333334
  currentAttention:     0
  sourceConfidence:     54.99999999999999
  profileCompleteness:  70
  trendDirection:       "STABLE"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://pt.wikipedia.org/wiki/Philadelphia_Jack_O'Brien"
    title: "Philadelphia Jack O'Brien"
    type:  "WIKIPEDIA"
  - url: "https://ar.wikipedia.org/wiki/%D9%81%D9%8A%D9%84%D8%A7%D8%AF%D9%84%D9%81%D9%8A%D8%A7_%D8%AC%D8%A7%D9%83_%D8%A3%D9%88%D8%A8%D8%B1%D8%A7%D9%8A%D9%86"
    title: "فيلادلفيا جاك أوبراين"
    type:  "WIKIPEDIA"
  - url: "https://arz.wikipedia.org/wiki/%D9%81%D9%8A%D9%84%D8%A7%D8%AF%D9%84%D9%81%D9%8A%D8%A7_%D8%AC%D8%A7%D9%83_%D8%A7%D9%88%D8%A8%D8%B1%D8%A7%D9%8A%D9%86"
    title: "فيلادلفيا جاك اوبراين"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/Philadelphia_Jack_O%E2%80%99Brien"
    title: "Philadelphia Jack O’Brien"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/Philadelphia_Jack_O'Brien"
    title: "Philadelphia Jack O'Brien"
    type:  "WIKIPEDIA"
  - url: "https://fr.wikipedia.org/wiki/Philadelphia_Jack_O'Brien"
    title: "Philadelphia Jack O'Brien"
    type:  "WIKIPEDIA"
  - url: "https://ga.wikipedia.org/wiki/Philadelphia_Jack_O'Brien"
    title: "Philadelphia Jack O'Brien"
    type:  "WIKIPEDIA"
  - url: "https://it.wikipedia.org/wiki/Philadelphia_Jack_O'Brien"
    title: "Philadelphia Jack O'Brien"
    type:  "WIKIPEDIA"
  - url: "https://ja.wikipedia.org/wiki/%E3%83%95%E3%82%A3%E3%83%A9%E3%83%87%E3%83%AB%E3%83%95%E3%82%A3%E3%82%A2%E3%83%BB%E3%82%B8%E3%83%A3%E3%83%83%E3%82%AF%E3%83%BB%E3%82%AA%E3%83%96%E3%83%A9%E3%82%A4%E3%82%A8%E3%83%B3"
    title: "フィラデルフィア・ジャック・オブライエン"
    type:  "WIKIPEDIA"
  - url: "https://pl.wikipedia.org/wiki/Philadelphia_Jack_O%E2%80%99Brien"
    title: "Philadelphia Jack O’Brien"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q2779046"
    title: "Wikidata"
    type:  "WIKIDATA"

# bio (long form, separated for readability)
bio: |
  Imported from discovery source: wikidata-dump