John Greenleaf Whittier
John Greenleaf Whittier (December 17, 1807 – September 7, 1892) was an American poet.  He was from Haverhill, Massachusetts and was a Quaker.  Like many Quakers, Whittier believed that slavery was wrong.  Whittier was active in the movement to end American slavery, and was a member of the anti-slavery Liberty Party.