Born in
New York City, Mckiniry attended the public schools. He graduated from the
College of St. Francis Xavier, New York City, and from the New York Law School. He was
admitted to the bar in 1899 and commenced the practice of his profession in New York City. He served as assistant
District Attorney of Bronx County 1914–1917. Secretary of the State supreme court, first district from 1917 to 1919.
Congress Mckiniry was elected as a
Democrat to the
Sixty-sixth Congress (March 4, 1919 – March 3, 1921). He was an unsuccessful candidate for reelection in 1920 to the
Sixty-seventh Congress.
Later career and death He was appointed a magistrate of New York City on January 1, 1923, and served until August 15, 1943, when he retired due to ill health. He died in
Yonkers, New York, May 30, 1950. He was interred in Calvary Cemetery,
Long Island City, New York. ==Sources==