János Fejérvári completed his violin and viola studies at the Ferenc Liszt Academy in Budapest. As a student he attended chamber music classes conducted by György Kurtág and András Schiff, and between 1981 and 1985 was principal violist at the Budapest Opera. He is a founder member of the Budapest String Chamber Orchestra, playing first viola there for many years. He also serves as a viola and chamber music professor at the Béla Bartók Conservatory in Budapest.