Walter Whitman (; May 31, 1819 – March 26, 1892) was an American poet, essayist, and journalist. A humanist, he was a part of the transition between transcendentalism and realism, incorporating both views in his works. Whitman is among the most influential poets in the American canon, often called the father of free verse. His work was controversial in its time, particularly his poetry collection Leaves of Grass, which was described as obscene for its overt sensuality. Whitman's own life came under scrutiny for his presumed homosexuality.

Born in Huntington on Long Island, as a child and through much of his career he resided in Brooklyn. At age 11, he left formal schooling to go to work. Later, Whitman worked as a journalist, a teacher, and a government clerk. Whitman's major poetry collection, Leaves of Grass, was first published in 1855 with his own money and became well known. The work was an attempt at reaching out to the common person with an American epic. He continued expanding and revising it until his death in 1892. During the American Civil War, he went to Washington, D.C. and worked in hospitals caring...