Denis O'Leary (January 22, 1863 – September 27, 1943) was born in Manhasset, Long Island, New York. He attended and later taught in the public schools. He was graduated from the law school of New York University in 1890. O`Leary was admitted to the bar the same year and commenced practice in New York City. He was assistant corporation counsel of New York City in 1905 and 1906 and commissioner of public works of Queens Borough in 1911 and 1912. O`Leary was elected as a Democrat to the Sixty-third Congress and served from March 4, 1913, until December 31, 1914, when he resigned. He later served as district attorney of Queens County 1915-1921 and resumed the practice of law until 1929 when he retired. He died in Douglaston, Queens County, N.Y., September 27, 1943.
- United States Congress. "Denis O'Leary (id: O000064)". Biographical Directory of the United States Congress.
- Denis O'Leary at Find a Grave
- New York Times, Denis O'Leary, 80, Ex-Representative; Gave Up Congress Seat to Win Queens District Attorneyship, September 28, 1943
- Executive Profile: Dennis M. O'Leary, Co-Founder, Chief Executive Officer, and President, DarkPulse Technologies Inc.
|U.S. House of Representatives|
|Preceded by |
George H. Lindsay
| Member of the U.S. House of Representatives |
from New York's 2nd congressional district
C. Pope Caldwell
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