Christian Fellner was born in London and received his earliest musical training from his father, a professional organist. He studied piano, organ, harpsichord and singing and formed his own ensemble to perform baroque chamber music before beginning full-time vocal studies at Trinity College of Music, London. He continued his studies after graduation at the Central School of Speech and Drama, University of London, and with Professor Yevgenia Sheveliova in Moscow, Russia. 

Christian Fellner has performed widely in the UK, Europe and Middle East as a recitalist and chamber musician. His repertoire ranges from baroque chamber cantatas by Clérambault, Frescobaldi, Scarlatti and JS Bach to songs by twentieth century composers Georgii Sviridov and Ned Rorem.

In Russia, Christian Fellner has given recitals with the Sviatoslav Richter International Foundation in Moscow and Tarusa and sang Schubert's Schwanengesang at the Scriabin Museum in Moscow. He has also given several recitals at Oxford University including a Russian Song programme at the Holywell Music Room. 

His recording of Schubert Lieder with pianist Slava Poprugin was released in May 2016 and is available on iTunes, Amazon and to stream on Spotify.