Mark Twain was the pen name of Samuel Langhorne Clemens. American writer, journalist, humorist, Twains varied works include novels, travel narratives, short stories, sketches, and essays. Hes famous for The Adventures of Huckleberry Finn, The Adventures of Tome Sawyer, and A Connecticut Yankee in King Arthurs Court, and has been likened to Walt Whitman as one of the most quintessentially American writers this country has produced.