John Allen Hill (played by Keene Curtis) is the owner of Melville's, the seafood restaurant located directly above Cheers. Though Melville's was mentioned often throughout the series, Hill did not first appear until season 9, during which he bought the restaurant and first became its proprietor.
He told Sam that he is also the rightful owner of Cheer's, and demanded rent for use of the back area while using the main area as a lounge for Melville customers. Unpaid rent resulted in half of Cheers being sealed off. This story arc continued until Rebecca bought the affected property from Hill.
Hill is a pompous, acerbic, older man with a disdain for the Cheers gang, he considers them to be low-class buffoons. In the season nine episode entitled Achilles Hill, Sam dated Hill's daughter Valerie as a way to get back at Hill for his condescending attitude towards the himself and Cheers.
Hill and Carla have a complicated love-hate relationship; they frequently insult and curse each other even during their frequent periods of sexual liaison.