Pretty sure he also wrote a pamphlet on the Movie, “The Exorcist.” which I recollect handing out at a showing of the movie sometime in the 1970s. He has a good deal of other things.
https://en.wikipedia.org/wiki/John_Warwick_Montgomery
http://www.jwm.christendom.co.uk/
There is a picture of him at the second site.
Thanks much. I didn’t find that title in his output list. Maybe I’m mixing authors and titles up. Sigh.