I recently found an old add for subscriptions to the mag. It has a picture of the magazine Vol 4 No 1with a cartoon on the cover of the mag with wording "Two One-Track Minds: The cartoon Genius of Fontaine Fox and Rowland Emett".
In type below the picture of the magazine cover with that phrase is source identification "Cover Cartoon by Big Wayne Gravelle".
No idea if this may be the name you are looking for