Walt Whitman was an influential American poet who published Leaves of Grass in 1855, revolutionizing poetry with its free verse and celebration of the human body and sexuality. He worked as a journalist, teacher, and government clerk. During the Civil War, Whitman volunteered in Washington hospitals, caring for wounded soldiers. He published several editions of Leaves of Grass over his lifetime, gaining recognition as the "Good Gray Poet" and chronicling his experiences in the war and travels in Specimen Days. Whitman lived his later years in Camden, New Jersey, where he died in 1892.