what horror novelist noted:Fear and death are two of the human constants?

Answer 1

Stephen King.

He says, "Fear and death are two of the human constants. But only the writer of horror and the supernatural gives the reader such an opportunity for total identification and catharsis…." King's work is a hybrid, utilizing the styles of both the traditional horror tale, as practiced by Edgar Allen Poe and Bram Stoker, and the modern commercial thriller which utilizes phenomena such as parapsychology and ESP."

Answer 2

You might also check out H.P. Lovecraft's Supernatural Horror in Literature.