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Denis O'Brien (New York politician)

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Denis O'Brien (New York politician)

For other people of the same name, see Dennis O'Brien (disambiguation).
Denis O'Brien
Judge of the New York Court of Appeals
In office
New York State Attorney General
In office
Preceded by Leslie W. Russell
Succeeded by Charles F. Tabor
Personal details
Born (1837-03-13)March 13, 1837
Ogdensburg, New York
Died May 18, 1909(1909-05-18) (aged 72)
Watertown, New York
Nationality  United States
Political party Democratic

Denis O'Brien (March 13, 1837 – May 18, 1909) was an American lawyer and politician.


He was admitted to the bar in 1861, and commenced practice in Watertown. He was elected Mayor of Watertown in 1872.

He was New York State Attorney General from 1884 to 1887, elected on the Democrat ticket in 1883 and 1885.

In 1889, he was elected a judge of the New York Court of Appeals, was re-elected in 1903, and remained on the bench until the end of 1907 when he reached the constitutional age limit of 70 years.

He died from appendicitis at his home in Watertown.

His son John F. O'Brien also was a judge of the New York Court of Appeals.


  • Denis O'Brien Bio at
  • in NYT on September 6, 1903
  • Obit in NYT on March 19, 1909
Legal offices
Preceded by
Leslie W. Russell
New York State Attorney General
Succeeded by
Charles F. Tabor
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