Samuel Langhorne Clemens (1835-1910), better known by the pen name Mark Twain, was an American humourist, satirist, lecturer and writer. Twain is most noted for his novels The Adventures of Tom Sawyer (1876) and Adventures of Huckleberry Finn (1885). He is also known for his quotations. His first important work, The Celebrated Jumping Frog of Calaveras County, was published in 1865. His next publication was The Adventures of Tom Sawyer, which drew on his youth in Hannibal. The character of Tom Sawyer was modelled on Twain as a child, with traces of two schoolmates, John Briggs and Will Bowen. His next major published work, Adventures of Huckleberry Finn, solidified him as a noteworthy American writer. Some have called it the first Great American Novel. Finn was an offshoot from Tom Sawyer and proved to have a more serious tone than its predecessor. The main premise behind Huckleberry Finn is the young boy's belief in the right thing to do even though the majority of society believes that it was wrong.