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He was born in New York City and attended the public schools. Siegel graduated from New York University School of Law in 1901 and was admitted to the bar on May 26, 1902. He commenced practice in New York City thereafter and was appointed special deputy attorney general for the prosecution of election frauds in 1909 and 1910. Siegel was elected as a Republican to the Sixty-fourth and to the three succeeding United States Congresses (March 4, 1915 – March 3, 1923).
He was chairman of the Committee on the Census (Sixty-sixth and Sixty-seventh Congresses). He was not a candidate for renomination in 1922. During the First World War, he was a member of the overseas commission which visited France and Italy during July and August 1918. He was also delegate to the Republican National Conventions in 1916, 1920, 1924, and 1936.
On September 14, 1940, Siegel was appointed to the bench and served as justice of the domestic relations court of New York City until his death. He died in an accidental fall from a window in his New York City apartment. He is interred at Union Field Cemetery in Ridgewood, NY.
- "Siegel, Isaac, (1880-1947)". Biographical Guide to the United States Congress. United States Congress. Retrieved 2016-09-01.
- Kurt F. Stone, The Jews of Capitol Hill: A Compendium of Jewish Congressional Members, 2010, pages 99-100
- Works by or about Isaac Siegel at Internet Archive
- United States Congress. "Isaac Siegel (id: S000404)". Biographical Directory of the United States Congress. Retrieved on 2013-08-28
- Isaac Siegel at Find a Grave Retrieved on 2013-08-28
- Isaac Siegel at Political Graveyard Retrieved on 2013-08-28
- Guide to the Isaac Siegel Papers at the American Jewish Historical Society, New York City
This article incorporates public domain material from the Biographical Directory of the United States Congress website http://bioguide.congress.gov.
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