Ballet master
Ballet Master (also Balletmaster, Ballet Mistress, Premier Maître de ballet or Premier Maître de ballet en Chef) is the term used for an employee of a ballet company who is responsible for the level of competence of the dancers in their company. In modern times, ballet masters (or ballet mistress for a female) are generally charged with teaching the daily company ballet class and rehearsing the dancers for both new and established ballets in the company's repertoire. The artistic director of a ballet company may also be called its ballet master.
History of the position
Especially during the early centuries of ballet troupes and ballet companies from the 18th century until the early 20th century, the position of First Ballet master, referred to traditionally as the Premier Maître de ballet en Chef or more simply as the Maître de ballet, was the undisputed head of the company who acted as chief choreographer and Artistic Director. His duties included creating ballets, dances in operas, commissioning music, and presiding over the teaching of the dancers and style desired. It was this head ballet master who had the responsibility of the artistic directorship of a particular group of dancers or of a theatre.