Born in Tver, Russia, the young baritone Aleksei Isaev studied at the Gnessin Academy of Music in Moscow.
In 2011, he became soloist at the prestigious Helikon Theater in Moscow, where he performed a vast repertoire : Eugen Oneguin, Prince Yeletsky and Tomsky (The Queen of Spades), Conte di Luna (Il Trovatore), Silvio (Pagliacci), the Demon, Escamillo (Carmen), Conte d’Almaviva (Le Nozze di Figaro)… He sang also Germont (La Traviata) at the Tchaïkovski Hall in Moscow.
Abroad, he was Renato (Un Ballo in maschera) and Griaznoï (The Tsar’s Bride) at the Tallinn Opera House, as well as Enrico (Lucia di Lammermoor) at the Semperoper in Dresden. He played also the role of Iago (Otello) at the Staatstheater Wiesbaden alongside Gregory Kunde
In January 2020, he jumped in as the title role of the Demon at the Bordeaux Opera.
After the pandemic, he sang Scarpia (Tosca) and Aleko at the Helikon Theater, Conte di Luna in Wiesbaden, as well as Germont in Helsinki.
In October 2022, he obtained a great success at the Capitole de Toulouse as Vodnik (Rusalka), a role he returned to in February 2023 for his debut at Covent Garden, under the baton of Semyon Bychkov. A few months later, he replaced Ludovic Tézier in the role of the Count of Luna for the final performance of Il Trovatore, still at Covent Garden.
Other projects include Don Carlo di Vargas (La Forza del Destino) at Covent Garden, Don Pizarro (Fidelio) at the Dijon Opera, Die Frau ohne Schatten in Toulouse, Conte di Luna at the Hamburg Staatsoper, Iago at the Dresden Semperoper, Nabucco in Toulouse and Scarpia at Covent Garden, alongside Sonya Yoncheva and Yusif Eyvazov.