James Joseph Brown | |
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| Born | September 27, 1854 Waymart, Pennsylvania, U.S. |
| Died | September 5, 1922 (aged 67) Hempstead, New York, U.S. |
| Occupation(s) | Mining engineer, investor, socialite |
| Years active | 1877–1922 |
| Known for | Miner, made rich by Little Jonny mine in Leadville |
| Spouse(s) | Margaret Tobin (m. 1886, sep. 1909) |
| Children | 2 |
James Joseph "J.J." Brown (September 27, 1854 – September 5, 1922), was an American mining engineer, inventor, and self-made member of fashionable society. His wife was RMS Titanic survivor Margaret Brown.