Mark Twain was an American writer, humorist, entrepreneur, publisher, and lecturer. Mark Twain was lauded as the "greatest humorist the United States has produced," and William Faulkner called him "the father of American literature".
Plato was an Athenian philosopher in Ancient Greece. He was the founder of the Platonist school of thought, and the Academy, the first institution of higher learning in the Western world.
added by ROTJ
Leonardo da Vinci lived between 1452-1519. He was an Italian polymath of the High Renaissance who is widely considered one of the most diversely talented individuals ever to have lived.