Samuel Langhorne Clemens (1835-1910), best known by his pen name Mark Twain, was an author and humorist noted for the novels The Adventures of Huckleberry Finn (which has been called "The Great American Novel") and The Adventures of Tom Sawyer, among many other books. Twain was raised in Hannibal, Missouri, which later provided the setting for Tom Sawyer and Huckleberry Finn, and he spent time as a riverboat pilot on the Mississippi River before finding fame as a writer.