John Mark Gannon | |
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| Titular Archbishop of Tacarata Bishop of Erie Titular Bishop of Nilopolis | |
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| See | Diocese of Erie |
| Installed | December 16, 1920 |
| Term ended | December 9, 1966 |
| Predecessor | John Edmund Fitzmaurice |
| Successor | John Francis Whealon |
| Other post(s) | Auxiliary Bishop of Erie (1918-1920) |
| Orders | |
| Ordination | December 21, 1901 |
| Consecration | February 6, 1918 |
| Personal details | |
| Born | June 12, 1877 |
| Died | September 5, 1968 (aged 91) Erie, Pennsylvania, US |
| Denomination | Roman Catholic |
| Motto | Ut diligatis invicem |
| Coat of arms |  |
Ordination history of John Mark Gannon | |||||||||
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John Mark Gannon (June 12, 1877 – September 5, 1968) was an American clergyman of the Roman Catholic Church. He served as Bishop of Erie from 1920 to 1966, and was given the personal title of Archbishop in 1953. He previously served as an auxiliary bishop of the same diocese from 1918 to 1920.