After graduating from the Specialised Secondary School of the St Petersburg Conservatoire in 1991 (trombone, class of Georgy Strautman) he continued his studies at the St Petersburg State Rimsky-Korsakov Conservatoire (trombone, class of senior lecturer Boris Vinogradov and Professor Viktor Sumerkin).
In autumn 1991 he joined the Mariinsky Theatre as a Stage Band musician, entering the Symphony Orchestra in 1996 (trombones). Conductor of the Mariinsky Theatre Stage Band since 2007. Valery Gergiev invited him to conduct Donvena Pandoursky´s versions of the ballets Le Sacre du printemps and The Magic Nut.
Alexei Repnikov established the Grand Brass Ensemble. He founded the Brass Evenings at the Mariinsky International Festival, first run at the Mariinsky Theatre Concert Hall in March 2008.