A mixologist is a professional who specializes in creating and serving alcoholic beverages. A TAPSTER is a person who serves beer from a keg or cask, while a BARMAN is a person who works behind a bar, serving drinks and snacks. A BARTENDER is a person who mixes and serves drinks at a bar, and a barkeep is a person who tends bar, mixing and serving drinks. All of these roles are related to the job of a mixologist, who is responsible for creating and serving alcoholic beverages.