R. L. Stine
American writer and producer (born 1943)
Robert Lawrence Stine is an American novelist. He is the writer of Goosebumps, a horror fiction novel series for children which has sold over 400 million copies globally in 35 languages, becoming the second-best-selling book series in history. The series spawned a media franchise including two television series, a video game series, a comic series, and two feature films. Stine has been referred to as the "Stephen King of children's literature".
via WikipediaBooks (36)
Welcome to Dead House
Book 1
Monster Blood
Book 3
Monster Blood for Breakfast!
Book 3
Let's Get Invisible!
Book 6
Night of the Living Dummy
Book 7

Welcome to Camp Nightmare
Book 9
The Ghost Next Door
Book 10

The Werewolf of Fever Swamp
Book 14
Deep Trouble
Book 19
It Came from Beneath the Sink!
Book 30
Attack of the Mutant (Goosebumps #25)

Bad Moonlight
Be Careful What You Wish For (Classic Goosebumps #7)
Beast from the East
Calling All Creeps (Goosebumps #50)
Chicken Chicken (Goosebumps #53)
Ghost Beach (Classic Goosebumps #15)
Girl Who Cried Monster
Go Eat Worms! (Classic Goosebumps #38)

Goodnight Kiss 2
Hide and Shriek
House of Whispers
How I Got My Shrunken Head (Classic Goosebumps #10)
How to Kill a Monster (Goosebumps #46)
It Came From Ohio!: My Life As a Writer
My Friends Call Me Monster (Goosebumps HorrorLand #7)
My Hairiest Adventure (Goosebumps #26)
One Day at Horrorland
Phantom of the Auditorium (Classic Goosebumps #20)
Stay Out of the Basement (Classic Goosebumps #22)
The Barking Ghost (Goosebumps #32)

The Blob that Ate Everyone
The Haunted Mask (Goosebumps Most Wanted)
The Haunted Mask II (Classic Goosebumps #34)
Vampire Breath (Classic Goosebumps #21)
Why I'm Afraid of Bees (Goosebumps #17)