Steiger's books on UFOs, spirituality, and the paranormal have generally sold well, but have been criticized by many academics for spurious content, lack of scientific evidence, and failure to cite sources, among other reasons. Anthropologist Bonita Freeman-Witthoft gave Steiger's
Medicine Power an entirely negative review. She noted that Steiger failed to cite scholarly sources, gave faulty
documentation and his reporting of
mythology was inaccurate. She concluded that "It is a disappointing work of no use to scholars and of little use to a person sincerely interested in American Indian spirituality."
Sarah Higley gave Steiger's
The Werewolf Book a mixed review and concluded "with a definite penchant for the sensational at the expense of the accurate, the casual reader will find much in it informative and entertaining as well." Skeptical investigator
Joe Nickell considers Steiger an unreliable source and has noted that he "endlessly cranks out books promoting paranormal claims". His books have also drawn criticism from
Jason Colavito who has stated they are filled with
pseudoscientific claims. == Bibliography ==