Nikolai Nikolayevich Tcherepnin (Russian: Николай Николаевич Черепнин; – 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. Life Nikolai Tcherepnin was born in 1873 to a well-known and wealthy physician of the same name. The elder Nikolai moved in elite circles of artists including Fyodor Dostoyevsky and Modest Mussorgsky. Young Nikolai's mother died when he was a baby, and when his father remarried, was replaced by an ambivalent stepmother. As a child, Nikolai's father beat him regularly and enforced a general code of strict discipline. At his father's insistence, Nikolai earned a law degree, though during this time he composed steadily. In 1895 he graduated with his degree in law from the University of Saint Petersburg. In 1898, he earned a degree in composition under Nikolai Rimsky-Korsakov and a degree in piano under K.K. Fan-Arkh. His talents and high family status earned him a job as the orchestral teacher at the Court Chapel in 1899. For six years he taught there before returning to the St. Petersburg Conservatory to teach there. During his 13-year tenure (from 1909 onward as professor) he taught many notable students, including Sergei Prokofiev, Aleksandr Gauk, Yuri Shaporin and Lazare Saminsky. In 1902 he became the regular conductor of the Russian Symphony Concerts and later made guest appearances with the Russian Musical Society, the Moscow Philharmonic Society, the Siloti Concerts and Ivan Vasilenko’s Historic Concerts as well conducting at the Mariinsky Theatre (1906–9). A member of the Belyayev circle, he was also involved with the Kruzhok sovremennoy muzïki (‘The Contemporary Music Circle’) and worked with the Mir iskusstva (‘World of Art’) movement. Tcherepnin was a friend of the musicologist Alexander Ossovsky. In 1907, during his time at the Conservatory, he wrote possibly his most famous work, the ballet Le Pavillon d'Armide. Two years later, Tcherepnin conducted the ballet at the premiere performance of Diaghilev's legendary Ballets Russes. He conducted for the entire first season and returned to conduct multiple times over the next five years. He conducted performances with the Ballets Russes in Berlin, Monte Carlo, Paris, Rome, and the Royal Opera House at Covent Garden in London. In addition to his professorship and his commitments with the Ballet, in 1908, he became conductor at the Mariinsky