Whitman encouraged Burroughs to develop his nature writing as well as his philosophical and literary essays. In 1867, Burroughs published Notes on Walt Whitman as Poet and Person, the first biography and critical work on the poet, which was extensively (and anonymously) revised and edited by Whitman himself before publication. Four years later, the Boston house of Hurd & Houghton published Burroughs's first collection of nature essays, Wake-Robin.