Agrippina Vaganova brought perhaps the most important developments in modern Russian Ballet. She graduated from the Imperial Ballet School in 1897 and danced with the Imperial Ballet, retiring from the stage early to pursue her teaching career following the Revolution. As the Soviet government had not yet re-established the school, Vaganova began her teaching career at the privately owned School of Russian Ballet, eventually joining the new Leningrad State Choreographic School in 1920. Vaganova was to become a highly renowned ballet teacher and is most noted for authoring "The Principles of Classical Dance", which outlines the training system she created and which heads the list of the numerous works produced by teachers of the school.