Mark Twain (1835-1910), the pen name of Samuel Langhorne Clemens, was one of America's most influential writers and humorists. Best known for The Adventures of Tom Sawyer and Adventures of Huckleberry Finn, Twain combined vernacular speech, satire, and sharp social observation to create enduring works of American literature. His fiction and essays examine themes of freedom, hypocrisy, technological progress, and moral contradiction, securing his place as a central figure in nineteenth-century American letters.