The maître d' (short for maître d'hôtel, literally "master of the hotel") in a suitably staffed restaurant or hotel is the person in charge of assigning customers to tables in the establishment and dividing the dining area into areas of responsibility for the various servers on duty. He or she may also be the person who receives and records advance reservations for dining, as well as dealing with any customer complaints and making sure all servers are completing their tasks in an efficient manner. In some localities or traditions particularly small organizations like a single restaurant the post is also known as the headwaiter or host. The origin of the term is in medieval courts, where the holder was an important courtier, like Olivier de la Marche in 15th century Burgundy.

A sommelier (pronounced / suh-mal-'yAy), or wine steward, is a trained and knowledgeable wine professional, commonly working in fine restaurants, who specializes in all aspects of wine service. The role is more specialized and informed than that of a wine waiter.

Their principal work is in the area of wine procurement, storage, and wine cellar rotation. They are also responsible for the development of wine lists and are responsible overall for the delivery of wine service and training for the other restaurant staff. Working along with the culinary team, they pair and suggest wines that will best complement each particular food menu item. This entails the necessity for a deep knowledge of how food and wine, beer, spirits and other beverages work in harmony. It could be argued that the role of a sommelier in fine dining today is strategically on par with that of the executive chef or chef de cuisine. A professional sommelier also works on the floor of the restaurant and is in direct contact with restaurant patrons. The sommelier has a responsibility to work within the taste preference and budget parameters of the patron.

In modern times, a sommelier's role is considered much broader than working only with wines, and must encompass all aspects of the restaurant's service, with an enhanced focus on wines, beers, spirits, soft-drinks, cocktails, mineral waters, and tobaccos. Some restaurants will employ a sommelier for water, one for whiskies, one for cigars, and so on.

Stephen Morrissey pouring at Intelli LA