Александр Константинович Глазунов (Alexander Glazunov; 10th August 1865–21st March 1936) was a Russian composer and influential music teacher. Glazunov was born in St Petersburg. He studied music under Nikolai Rimsky-Korsakov. The first of his nine symphonies was premiered in 1882, when Glazunov was sixteen years old. His popular "Stenka Razin" was also a youthful work. Glazunov also wrote three ballets. In 1899, Glazunov became a professor at the St Petersburg School of Music, and later its director.