JACKSON, Joseph Cooke, lawyer, born in Newark, New Jersey, 5 August, 1835. He was graduated at Yale in 1857, and subsequently studied law at Newark and at the law schools of Harvard and New York university. He was admitted to the bar in 1860, and began practice in New York city, but at the beginning of the civil war was appointed aide-de-camp to General Robert Anderson, and ordered to Kentucky. Subsequently he was commissioned 2d lieutenant in the 1st New Jersey regiment, and appointed aide to General Philip Kearny. While serving on the latter's staff he declined the colonelcy of the 61st New York regiment. In December, 1861, he was ordered to join the division staff of General William B. Franklin. In the summer of 1862 he was promoted to captain for gallant conduct during the seven days' conflict before Richmond, and assigned to the staff of the 6th corps of the Army of the Potomac. In the following December he was promoted lieutenant-colonel of the 6th New Jersey volunteers, and was brevetted colonel for "meritorious conduct" at the battle of Fredericksburg, in the same month. He was brevetted brigadier-general of volunteers on 13 March, 1865. At the close of his term of service, he was appointed by the War department a commissioner of the United States naval credits, and succeeded in having 1,900 naval enlistments from New Jersey credited to the quota of troops enlisted from that state, thus rendering a draft unnecessary. Governor Joel Parker said, in a message to the legislature, that the state had in consequence been saved the expenditure of nearly $1,000,000. General Jackson restarted the practice of law in New York city, and in 1870 was appointed assistant district-attorney for the southern district of New York.