The document provides biographical information about Mark Twain and summarizes his most famous work, Adventures of Huckleberry Finn. It notes that Twain was born in Missouri in 1835 to a slave-owning family, later moved to Hannibal where he became a riverboat pilot, and began writing under the pen name "Mark Twain." Adventures of Huckleberry Finn was published in 1885 and is considered one of the Great American Novels. The book satirizes Southern society and provides critical commentary on racism through the story of Huck Finn and Jim, a runaway slave. It remains very controversial due to its racial themes and implications.