Mark Twain was the pen name chosen by Samuel Langhore Clemens, author of favourite like The Adventures of Tom Sawyer. The Adventures of Huckleberry Finn. Life on the Mississippi and The Prince and the Pauper. After working as a printer and a Mississippi pilot, he turned to writing, telling with charm and humor to the American people and places he knew best, and creating, in Tom Sawyer and Huckleberry Finn, two of the best-loved young rogues in literature. He died in 1910, aged 15. Mark Twain took his pen name from the Mississippi river pilots’ jargon: by the mark twain’, meaning two fathoms depth by the sounding line.