To be honest I've never taken much notice of who's been responsible for the rules on games but as far as pinball art design goes then by far and away my favourite designer is Gordon Morison. Gordon was responsible for the art packages on over 150 Gottlieb machines mainly though the 70' but also into the 80's If you are unfamiliar with his work then look him up, it's well worth it. Centigrade 37, Asteroid Annie, Genie. Count-down, Gemini and Neptune are just some of my favourites.
After Gordon passed his family discovered he had a NOS backglass of every backglass he did art for - some doubles. Having little respect for his talents and lack of clue about value and provenance, what did they do with them all? - threw em all away in the skip.