Demidenko studied at the Gnessin State Musical College with Anna Kantor and at the Moscow Conservatoire under Dmitri Bashkirov.
[4] In addition to a vast amount of the standard Germanic and Russian repertory, he is a specialist of Frédéric Chopin and a noted champion of the works of neglected composers such as Muzio Clementi, Carl Maria von Weber, Jan Václav Voříšek, and Nikolai Medtner, as well as neglected works of well-known composers such as Domenico Scarlatti, Wolfgang Amadeus Mozart, Franz Schubert, and Robert Schumann, and transcriptions by Ferruccio Busoni.
[2] In 2000, in connection with the 250th anniversary of the death of Johann Sebastian Bach, Nikolai Demidenko was one of four pianists invited to perform Das Wohltemperierte Klavier, subsequently released on DVD by EuroArts.
For Hyperion Records he has recorded over 20 albums, including most recently Prokofiev Piano Concertos nos 2 & 3 with the London Philharmonic Orchestra released in March 2015, Gramophone Editor´s Choice award-winning album of Medtner and Music for two Pianos (with Dmitri Alexeev).
Demidenko was one of the pianists invited to perform Chopin Piano Concerto in E minor Op.