Igor Tomashevsky finished the Special Secondary School under the jurisdiction of the St Petersburg Rimsky-Korsakov Conservatory as a pianist and a composer. In 2009, he graduated from the St Petersburg Rimsky-Korsakov Conservatory as a composer (class by A. Mnatsakanyan) and in 2012 as an opera and symphonic conductor (class by E. Serov). Tomashevsky has performed with different Russian orchestras, including the Volgograd Academic Symphonic Orchestra, the Kostroma Governor’s Symphonic Orchestra, the Chamber Orchestra of the Novgorod Philharmonics. Since 2011, he has been a Professor at the Herzen University in St Petersburg. In 2013–2014, he performed as a guest conductor with the Mikhailovsky Theatre. In October 2014, he became a conductor of the Mikhailovsky Theatre.