The author is given as „J. E. Mayo“ in the “Special July Offer” of the magazine Words of Help, volume 47 (1958). He also wrote in the same magazine in 1962. Perhaps his address in this brochure might help to identify him more closely:
46 Kenilworth Road, St. Leonard's-on-Sea, Sussex.
I had quite a look and can't find anything for definite. There used to be a hall on that street; don't if that was connected and it might have been the address given.
This is the most likely candidate I could find in the National Probate Calendar:
There were two other J.E. Mayos but without an apparent connection to St Leonards-on-Sea:
Here is an interesting discovery from the 1901 Census: Joseph E. Mayo was staying with his aunt Eleanor E. Eland in London, in whose household the Germans Otto Berning, Ernst "Brockhems" and Ewald Zimmerman were living as boarders. "Brockhems" must undoubtedly be Brockhaus; Ernst Brockhaus (1879–1948) was a grandson of German Brethren pioneer Carl Brockhaus and a well-known Lowe-Continental Brother himself, and Berning was also a familiar Brethren name.
So I guess Joseph Eland Mayo (b. 19 April 1885) is our man. See also https://www.treesandgenes.com/MS/pafg236.htm#16250