was an American author and humorist. He is most noted for his novels, The Adventures of Tom Sawyer (1876), and its sequel, Adventures of Huckleberry Finn (1885), the latter often called "the Great American Novel."
Twain passed through a period of deep depression, which began in 1896 when his daughter Susy died of meningitis. Olivia's death in 1904 and Jean's on December 24, 1909, deepened his gloom. On May 20, 1909, his close friend Henry Rogers died suddenly. In 1906, Twain began his autobiography in the North American Review. In April, Twain heard that his friend Ina Coolbrith had lost nearly all she owned in the 1906 San Francisco earthquake, and he volunteered a few autographed portrait photographs to be sold for her benefit. To further aid Coolbrith, George Wharton James visited Twain in New York and arranged for a new portrait session. Initially resistant, Twain admitted that four of the resulting images were the finest ones ever taken of him.
In 1909, Twain is quoted as saying:
"I came in with Halley's Comet in 1835. It is coming again next year, and I expect to go out with it. It will be the greatest disappointment of my life if I don't go out with Halley's Comet. The Almighty has said, no doubt: 'Now here are these two unaccountable freaks; they came in together, they must go out together."
His prediction was accurate – Twain died of a heart attack on April 21, 1910, in Redding, Connecticut, one day after the comet's closest approach to Earth.
Twain's funeral was at the "Old Brick" Presbyterian Church in New York. He is buried in his wife's family plot at Woodlawn Cemetery in Elmira, New York. His grave is marked by a 12-foot (i.e., two fathoms, or "mark twain") monument, placed there by his surviving daughter, Clara. There is also a smaller headstone.
*source: Wikipedia