Who wrote Tom Sawyer?

Widow Douglas' life is saved by Huckleberry Finn after he followed Injun Joe and a confederate of his and realized they were plotting to disfigure her. Out of her gratitude, she takes Huck into her home, but he has trouble adjusting to "civilized" life and soon runs away. However, at the end of The Adventures of Tom Sawyer, Huck is persuaded by Tom Sawyer to return.