Alexei Antonov graduated from the Gnessins Russian Academy of Music in 2000.
He was a soloist at the Novaya Opera Theatre from 2000–2012. From 2012–2016 he was a soloist of the Komische Oper Theatre (Germany). He returned to Novaya Opera Theatre in 2016.
Alexei has performed in leading world theatres, such as the Lyons National Opera (France), Vlaamse Opera (Belgium), Teatro Municipal de Santiago (Chile), Theater Bonn (Germany), Opera Wrocławska (Poland) and the Latvian National Opera, to name a few.