Mark Twain founded the American voice. His works are a living national treasury: taught, quoted, and reprinted more than those of any writer except Shakespeare. His awestruck contemporaries saw him as the representative figure of his times, and his influence has deeply flavored the 20th and 21st centuries. Yet somehow, beneath the vast flowing river of literature that he left behind-books, sketches, speeches, not to mention the thousands of letters to his friends and his remarkable entries in private journals-the man who became Mark Twain, Samuel Langhorne Clemens, has receded from view, leaving us with only faint and often trivialized remnants of his towering personality.