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21 hours ago · Signature. Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910), [ 1 ] known by the pen name Mark Twain, was an American writer, humorist, and essayist. He was praised as the "greatest humorist the United States has produced," [ 2 ] with William Faulkner calling him "the father of American literature." [ 3 ]