Born in Bryansk. He graduated from the Moscow Conservatory (2004, Class E. Kibkalo). In 2004-2006 he studied at the Center Galina Vishnevskaya Opera. Winner of the International Contest "Russian Tenors" (Moscow, 2001), a diploma of the International Vocal Competition in Naples (Italy, 2005).
Since 2008 - the guest soloist of the Bolshoi Theater of Russia, performing the roles of Vaudemont in Tchaikovsky's opera "Iolanta" and Lykov in "The Tsar's Bride" by Rimsky-Korsakov. Singer Galina Vishnevskaya Opera Center.
Constantly he collaborates with such conductors as Valery Polyansky, Gennady Rozhdestvensky and Vladimir Fedoseyev. In 2000 he took part in the Russian premiere of Schnittke's "Gesualdo" (conductor Vladimir Polyansky).
Oleg Dolgov took part in productions of the opera "War and Peace" by Prokofiev and "Lohengrin" by Richard Wagner Festival in Spoleto (Italy, 1999, 2003), the opera "Slippers" by Tchaikovsky at the theater "La Scala" (Italy, 2005), Shostakovich opera "The Gamblers" (Ikharev Party) and "Big Lightning" (Party architect) to the "Holland Festival" in Amsterdam (Cappella Amsterdam and The Hague Residentie Orchestra, conducted by Martyn Brabbins, 2006). At the festival, named Rostropovich in Baku and Nizhny Novgorod performed song cycle "From Jewish Folk Poetry" by Shostakovich. In 2008, he sang on the stage Jose Klaipeda Musical Theatre (Lithuania), in 2009 took part in a concert performance of Tchaikovsky "Iolanta" with the Symphony Orchestra Tchaikovsky led Vladimir Fedoseyev in Tokyo. In 2010, Gregory sang in the opera "Boris Godunov" in the Walloon Royal Opera in Liege (Belgium) and at the International Festival in Santander (Spain). In 2011, at the International Opera Festival in Miskolc (Hungary), he sang in the opera Duke George. Verdi's "Rigoletto". As part of the soloists of the Bolshoi Theatre of Russia gave concerts in Seoul and Ulsan (South Korea). Has toured with concert programs in the cities of Russia, CIS and foreign countries.
His repertoire includes also roles: Lensky ("Eugene Onegin" by Tchaikovsky), Raymond ("The Maid of Orleans" by Tchaikovsky), Balakin ("Sorceress" by Tchaikovsky), Vakula ("The Night Before Christmas" by Rimsky-Korsakov ), Shepherd ("Oedipus Rex" by Igor Stravinsky), Don Carlos ("Don Carlos" George. Verdi), Rudolf ("Luisa Miller" George. Verdi), Alfredo ("La Traviata" by G.. Verdi), Ishmael ("Nabucco "George. Verdi), Young Gypsy (" Aleko "Rachmaninov), tenor in the Mass in B Minor by JS Bach," Nelson Mass "and the oratorio" The Seven Last Words of Christ on the Cross "by J. Haydn, Symphony number 9 L. van Beethoven's "Requiem" and the Mass in C Minor Mozart, "Little Missa Solemnis" and the Stabat Mater J. Rossini, Symphony number 6 Schubert, Symphony "Romeo and Juliet" Berlioz "Requiem "and Dvorak Stabat Mater," German Requiem "by Johannes Brahms" Requiem "by A. Bruckner," Requiem "by S. Berinsky, Symphony number 2 and Cantata" History of Dr. Johann Faust "by Alfred Schnittke.
Since 2012 he was also the soloist of the Moscow theater "Novaya Opera" named EV Kolobov. From November 2014 - soloist of the Bolshoi Theater of Russia.