Question: When was the composer of the ballet Raymonda, director of the Saint Petersburg Conservatory  ?

Context articles: Stanislav Gribkov
Raymonda Variations
Nikolai Tcherepnin
Sergei Stadler
Raymonda
Alexander Glazunov
Leonid Rezetdinov
Georgiy Ginovker
Alexander Radvilovich
Anna Nechaeva

Stanislav Gribkov is a Russian conductor and artistic director of the Saint Petersburg TV.
 In 1964 he became a teacher at the Saint Petersburg State University of Culture and Arts after graduating from the Saint Petersburg Conservatory the same year.
 In 1968 he began working at the Saint Petersburg TV and its radio station as well and twenty years later became choir master and artistic director at the same place.
 He has conducted over 500 works of various composers and was a winner of numerous international awards.
Raymonda Variations is a ballet made by New York City Ballet co-founder and ballet master George Balanchine to excerpts from the first act of Glazunov's "Raymonda" (1895–97).
 The premiere took place on 7 December 1961 at City Center of Music and Drama, New York, under the title "Valses et Variations".
 Balanchine and Alexandra Danilova had mounted a full-length production of "Raymonda" for the Ballet Russe de Monte Carlo in 1946.
Nikolai Nikolayevich Tcherepnin (Russian: Николай Николаевич Черепнин; May 15 [O.S. May 3] 1873 – 26 June 1945) was a Russian composer, pianist, and conductor.
 He was born in Saint Petersburg and studied under Nikolai Rimsky-Korsakov at the Saint Petersburg Conservatory.
 He conducted for the first Paris season of Sergei Diaghilev's Ballets Russes.
Sergei Stadler is a Russian musician who was born in Saint Petersburg on May 20, 1962.
 He studied the violin with David Oistrakh and Leonid Kogan and took the first prize and gold medal in the 1982 Tchaikovsky Competition in Moscow.
 He is also a laureate of the Jacques Thibaud competition in Paris, where he won the Grand Prize in 1980.
 He has performed as soloist with the London Philharmonic, the Russian National Symphony, and the Dresden Staatskapelle Orchestras, collaborating with world famous conductors, including Kurt Masur, Gennadi Rozhdestvensky, Mariss Jansons, Evgeny Svetlanov and Yuri Temirkanov.
 Sergei Stadler is now Artistic Director of the Hermitage Musical Academy in St Petersburg as well as Artistic Director of the State Theatre of Opera and Ballet of the St Petersburg Conservatory of Music.
Raymonda (Russian: Раймонда ) is a ballet in three acts, four scenes with an apotheosis, choreographed by Marius Petipa, with music by Alexander Glazunov, his opus 57.
 First presented by the Imperial Ballet at the Imperial Mariinsky Theatre on 19 January [O.S. 7 January] 1898 in Saint Petersburg, Russia.
 The ballet was created especially for the benefit performance of the Italian ballerina Pierina Legnani, who created the title role.
 Among the ballet's most celebrated passages is the "Pas classique hongrois" (a.k.a. "Raymonda Pas de dix") from the third act, which is often performed independently.
Alexander Konstantinovich Glazunov (Russian: Алекса́ндр Константи́нович Глазуно́в , 10 August 1865 – 21 March 1936) was a Russian composer, music teacher, and conductor of the late Russian Romantic period.
 He served as director of the Saint Petersburg Conservatory between 1905 and 1928 and was instrumental in the reorganization of the institute into the Petrograd Conservatory, then the Leningrad Conservatory, following the Bolshevik Revolution.
 He continued heading the Conservatory until 1930, though he had left the Soviet Union in 1928 and did not return.
 The best-known student under his tenure during the early Soviet years was Dmitri Shostakovich.
Leonid Fiatovich Rezetdinov (Russian: Леонид Фиатович Резетдинов ; August 5, 1961) is a Russian composer and a winner of the "National Prize" of the Russian Academy of Advertising.
 He was born in Leningrad (now Saint Petersburg) and attended Saint Petersburg Conservatory where he was under guidance of Boris Tishchenko till 1985.
 In 1988 he joined Russian Union of Composers and two years later became an attendee of the International Society for Contemporary Music where his teacher was Witold Lutosławski.
 For eight years after it, he was a teacher at the Musical College of Rimsky-Korsakov and by 2000 became a CEO and record producer at Studio Digital Film Production of Saint-Petersburg Documentary Film Studio.
 The same year he joined Music Fund and became an author of over 30 film scores.
 In 2009 he won the first prize at the Berdyansk International Film Festival and since then worked with various conductors such as Vladimir Altschuler, Valery Gergiev and Stanislav Gribkov.
 He also worked with Leonid Korchmar, Ravil Martynov, Vasily Petrenko, Rashid Skuratov, and Alexander Titov and have traveled throughout Europe, Asia and North America.
Dr. Georgiy Ginovker (Russian: Георгий Гиновкер) was born in St. Petersburg, Russia.
 He was principal cellist of Saint Petersburg Philharmonic Orchestra for many years.
 His primary teachers include Mstislav Rostropovich and Aleksander Schtrimer.
 A winner of several international competitions, Ginovker has appeared as a soloist in Russia, Europe, Japan, and the United States.
 He was Professor of Cello/Chamber Music at Saint Petersburg Conservatory and Rimsky-Korsakov College.
 Since 1992, Mr Ginovker resides in New York.
 Ginovker teaches cello and chamber music in New York.
 He is acting principal cellist of several orchestras in the New York Metro Area.
 He has recorded for international labels such as Melodiya and Bomba-Piter.
Alexander Yuryevich Radvilovich (Russian: Александр Юрьевич Радвилович ; born 1955) is a Russian composer, pianist and teacher from Leningrad (now Saint Petersburg) from which Conservatory he also graduated at which he was under guidance from Sergei Slonimsky.
 In 1992 and 1994 respectively he was the first ever composer of Russian origin to get education at the International New Music in Darmstadt.
 He is known for his symphonies of two of his own poems called "Legend About Violinist" and "Pushkin".
 At one time, after reading Fyodor Dostoyevsky he composed a string quartet called "The Boy at Christ’s New Year Celebration" and also designed a mini opera called "Let’s Write Fairy-tale".
 He also composed an opera called "Hindrance" which was based on Danii Kharms' poem "Ruin of the Gods".
 Currently he is a member of both Russian Composer’s and Saint Petersburg Composer's Unions and works as music pedagogue at the Humanitarian University of the Petersburg Conservatory.
 On occasion, he tours the world as composer, pianist and leader of the Sound Ways which he also founded back in 1989.
 His music is published by various labels in countries such as Russia, the Netherlands and the United States.
Anna Nechaeva is Russian soprano singer who was born in Saratov and used attend its Conservatory in 1996.
 Later she was offered to perform the role of "Tatiana" in "Eugene Onegin" at the Saint Petersburg Conservatory and by 2003 became a soloist at the Saint Petersburg Opera where she continued her original role as well as other title roles in Giacomo Puccini's "Gianni Schicchi", Madama Butterfly, and "Suor Angelica".
 From 2008 to 2011 she became a soloist at the Mikhaylovsky Theatre where she performed roles of "Nedda" in "Pagliacci" and "Rachel" in "The Jews" as well as the title roles of "Rusalka" and of course "Tatiana" in "Eugene Onegin".
 In 2012, she made her first public appearance with Bolshoi Theatre where she sang in "The Enchantress" portraying "Nastasya" becoming soloist there the same year.
 After her debut, she performed such roles as "Iolanta" in an opera of the same name as well as "Liu" in "Turandot" and "Yaroslavna" in "Prince Igor".