Rubinstein was in search for a violin professor for the Saint Petersburg Conservatory, which he had founded in 1862, and he proposed Auer. Auer agreed to a three-year contract, also as soloist at the court of Grand Duchess Helena. At first, music critics in St. Petersburg harshly criticized Auer's playing and compared it unfavorably with that of his predecessor, Wieniawski. But Tchaikovsky's admiration for Auer's playing led to its acceptance. Auer would stay for 49 years (1868-1917). During that time he held the position of first violinist to the orchestra of the St. Petersburg Imperial Theatres. This included the principal venue of the Imperial Ballet and Opera, the Imperial Bolshoi Kamenny Theatre (until 1886), and later the Imperial Mariinsky Theatre, as well as the Imperial Theatres of Peterhof and the Hermitage. Until 1906, Auer played almost all of the violin solos in the ballets performed by the Imperial Ballet, the majority of which were choreographed by Marius Petipa. Before Auer, Vieuxtemps and Wieniawski had played the ballet solos.