productions, in the process creating a new genre of French opera in which dance interludes played an important part in the musical drama. The ballets for these works were created by Beauchamps, des Brosses, and d'Olivet. Jean-Baptiste Dubos explains that Beauchamps and des Brosses were responsible for the ballets ordinaires, while d'Olivet specialized in ballet-pantomime: Lully paid such great attention to the ballets mentioned here that he engaged for their choreography a 'maître de danse particulier' named d'Olivet. It was he, and not des Brosses or Beauchamps, whom Lully engaged for the 'ballets ordinaires', who composed the ballets of the infernal scenes of Psyché and Alceste. It was also d'Olivet who composed the ballet of the old men in Thesée, of the baneful dreams in Atys, and of the tremblers in Isis. This last was composed solely of pantomimic gestures by men seized with cold, and he did not introduce a single usual dance step into it. Initially the dancers of the Paris Opera Ballet were all male. Mademoiselle de la Fontaine (1665–1738) became the first professional ballerina when she danced in the premiere of Lully's ballet Le Triomphe de l'Amour on 21 January 1681. Pierre Beauchamps continued to collaborate with Lully at the Paris Opera until Lully's death in 1687. Subsequent history The 18th century saw the creation of an associated school, now referred to as the Paris Opera Ballet School (French: École de Danse de l’Opéra de Paris), which opened in 1713. The operas of Rameau, and later Gluck, raised standards for the dancers. Jean-Georges Noverre was a particularly influential ballet master from 1776 to 1781. He created the ballet Les petits riens in 1778 on Mozart's music. Maximilien Gardel was ballet master from 1781, with his brother Pierre Gardel taking over after Maximilien's death in 1787. Pierre Gardel survived the Revolution creating ballets such as La Marseillaise and Offrande à la Liberté. He remained the ballet master until 1820 and continued to work up to 1829. In 1820, Pierre Gardel was succeeded as ballet master by Jean-Louis Aumer, who was however highly criticized for using too much mime and failing to use choreography which furthered plot or character. In 1821, the company moved to a new house, the Salle Le Peletier, where Romantic ballet was born. In 1875, the company moved to the Palais Garnier, where it continues to perform. Serge Lifar as ballet director In 1929,