The Goosebumps Series is a popular series of horror fiction books written by author R.L. Stine, who is commonly referred to by his initials, RLStine. His full name is Robert Lawrence Stine, and he is also known by his pen name, Jovial Bob Stine. The series consists of over 100 books and has sold over 400 million copies worldwide. RLStine is considered one of the most successful authors of all time.