Born: April 25, 1818, Northwood, New Hampshire.
Died: March 7, 1889, Gloucester, Massachusetts.
Buried: Locust Grove Cemetery, Gloucester, Massachusetts.

Henry was the son of Samuel Leonard and Cynthia Claggett. He married twice, to Anne Claggett and Adelia A. Norwood.
Leonard served as a chaplain of the 3rd Maine Regiment during the American civil war.
At the time of his death, he was pastor of a Universalist Church in Annisquam, Massachusetts.