Brad Steiger

Brad Steiger (February 19, 1936 - May 6, 2018) was an American author of popular works on anomalous phenomena (including cryptozoology, ufology, and parapsychology), true crime, and biographies, writing prolifically both under his own name and pseudonymously.

as Eric Norman
"Eric Norman" was a pseudonym that Steiger shared with Warren Smith, the pair sometimes co-authoring books credited under the name.