1837 births 1921 deaths 19th-century American writers 19th-century atheists 19th-century essayists 20th-century American essayists 20th-century atheists American atheists American naturalists American nature writers American male non-fiction writers People from Esopus, New York People from Roxbury, New York People from the Catskills Scientists from New York (state) Members of the American Academy of Arts and Letters