Wikipedia:Articles for deletion/Peter John Mayo
I think that the editorship of the Journal of Belarusian Studies passes  C8.  Verification that he held it at least briefly is here http://belarusjournal.com/article/foreword-194.  Weak because the journal went on hiatus for 25 years, apparently immediately after the subject's editorship, which might suggest that it is debatable whether the journal is/was "well-established."  Google Scholar may not cover very well the period in which Mayo was mainly active, and his common name makes it harder to search.  The article is not in great shape, but doesn't strike me as overly promotional, and as usual 
— User:Russ, 06:26, 13 July 2021 (UTC)
Stance: keep
Cited policy: WP:NPROF||WP:DINC (Wikipedia:Notability)