R. L. Stine has written more than two hundred thriller and horror books for children, teens, and adults. His Goosebumps series, which was the bestselling series of all time for many years, is widely considered the consummate horror series for kids, with more than four hundred million copies sold. Unusually prolific, he has written many other series, including Fear Street, Mostly Ghostly, and Rotten School, as well as other stand-alone books for people of all ages.