John R. Slattery | |
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| Personal details | |
| Born | July 16, 1851 New York City |
| Died | March 6, 1926 (aged 74) New York City |
| Nationality | American |
| Occupation | Activist, author, and former missionary |
John Richard Slattery (July 16, 1851 – March 6, 1926) was an American former Catholic priest, activist, missionary, writer, and lawyer. He was first a member of the Mill Hill Missionaries, later becoming in 1893 a co-founder and the first superior general of the Society of St. Joseph of the Sacred Heart (also known as the Josephites).[1]