Walt whitman, who was born 200 years ago this year, is almost certainly the greatest American poet. In many ways, he is also the most enigmatic. Before 1855, the year that Whitman published Leaves of Grass, he had achieved no distinction whatsoever. He had no formal education—no Oxford, no Cambridge, no Harvard or Yale. His life up to his 35th year had been anything but a success. He’d been a teacher, but he was loose and a bit indolent, and he refused to whip his students.