Samuel Langhorne Clemens (November 30, 1835 - April 21, 1910), well known by his pen name Mark Twain, was an American author and humorist. Twain is noted for his novels Adventures of Huckleberry Finn (1885), which has been called "the Great American Novel," and The Adventures of Tom Sawyer (1876). He also wrote poetry, short stories, essays, and non-fiction.