"You had better shove this in the stove," Mark Twain said at the top of an 1865 letter to his brother, "for I don't want any absurd 'literary remains' and 'unpublished letters of Mark Twain' published after I am planted." He was joking, of course. But when Mark Twain died in 1910, he left behind the largest collection of personal papers created by any nineteenth-century American author. Who Is Mark Twain? presents twenty-six wickedly funny, disarmingly relevant pieces by the American master—a man who was well ahead of his time.