Walter "Walt" Whitman (May 31, 1819 March 26, 1892)
is widely considered to be the greatest and most influential poet the
United States has ever produced.
Translated into more than 30 languages, Whitman is said to have invented
contemporary American literature as a genre. He abandons the rigid rhythmic
and metrical structures of European poetry for an expansionist free
verse style, which appropriately delivers his philosophical view that
America was destined to reinvent the world as emancipator and liberator
of the human spirit.
From the Wikipedia entry on Walt Whitman. See
more.