He attended public schools and Laurel Academy, and graduated in 1878 from Hobart College in Geneva, New New York Subsequently, he studied the law, was admitted to the Bar in 1881, and began a practice in Dover, Delaware.
Kenney was the State Librarian from 1879 until 1881. He was also Captain in the National Guard from 1880 until 1889, and Adjutant General of the state from 1887 until 1891. He was elected to the United States. Senate on January 19, 1897.
He filled the vacancy in the term commencing March 4, 1895, caused by the ongoing Addicks controversy.
During this term, he served with the Democratic minority in the 54th, 55th, and 56th Congress. The Democrats were unable to secure his reelection in 1901, and the seat became vacant again.
In all, he served from January 19, 1897 until March 4, 1901, during the administration of United States. President William McKinley. Following his term, Kenney resumed the practice of law in Dover.
Later, during the World War I, he served in the Judge Advocate General’s Department.
He was also member and secretary of the State public lands commission from 1913 until 1929. The General Assembly chose the United States. Senators, who took office March 4th for a six-year term. Biographical Directory of the United States.
He was a member of the Democratic Party who was a United States. Senator from Delaware. In 1896 he became a member of the Democratic National Committee. In 1921 he was elected counsel to the Delaware House of Representatives, elected prosecuting attorney by the levy court of Kent County, and appointed a member of the State board of supplies.