Timmy the Timid Ghost, despite being one of the many characters created with hopes of following the fabulous success of Casper, had a very respectable 43 issue, 11 year run. Al Fago did most of the Timmy issues, but this story and cover was done by Jon D'Agostino; whose nearly half-century career covered every genre of comic book work (including, most notably, great work for Archie Comics). D'Agostino passed away in 2010.
These two ad pages are from the same issue.