During his residence in Massachusetts, he published The Golden Age of American Oratory (Boston, 1857), and Reminiscences of Rufus Choate (N. Y, 1860).
On the breaking out of the American Civil War, Col. Parker (having acquired his title from his position on the staff of Gov.
Later he was adjutant general and chief of staff of Gen. Martindale during the time that the latter commanded the Department of Washington.
At the close of the war he settled in New York, and went into business in Wall St. Not being particularly successful, he took charge of the American Literary Bureau of Reference, and was thus engaged at the time of his death, at the Everett House in New York City, March 30, 1868, aged 42 years.
This article incorporates public domain material from the Yale Obituary Record.