Stefan started playing violin at the age of 6. 4 years later performed his first recital and entered the violin class of State Conservatory in Košice, Slovakia. 11 years old, made his debut with Slovak State Philharmonic Bratislava conducted by Ondrej Lenárd and two years later, with State Philharmonic in Košice, performing M. Bruch's Concert g minor. Since than followed regular solo performances with Slovak State Philharmonic Košice as well as recitals in Slovakia and abroad. At the age of 12 did record for Slovak Radio, where was presented together with Julia Fischer. Later on, Stefan was asked to perform for M.Kováč and R. Schuster, both Presidents of Slovak Republic. During his studies in Slovakia was awarded with 1st and Absolute Winner Prizes at National Competition of Slovak Conservatories. He holds also prizes from International Violin Competitions of Jaroslav Kocian and Bohuslav Martinu, Czech Republic. Important impulses were Masterclasses with R.Nodel, I. Bezrodnyj and V.Spivakov.
At the age of 20, youngest in the history, won the leading position in State Philharmonic Košice, leaving soon for his studies in Lucerne, Switzerland. He became also Concertmaster of European Philharmonic Orchestra ( co-founded by Y. Menuhin) in Vienna as well as Concertmaster of Camerata Helvetica ( Urs Schneider) . In 2011 Stefan wins one of the leading positions at Palau de les Arts Reina Sofia in Valencia, Spain, ( Musical director L. Maazel ). Troughout his orchestral experiences he has served, also as Concertmaster, under Z. Mehta, R. Chailly, N. Marriner, V.Gergiev, B. Haitink, Sir A. Davis, P. Domingo and many other world leading conductors.
Zubin Mehta wrote : "I know Mr. Eperjesi since several years playing in Orchestra of Palau de les Arts in Valencia. He performed under my direction also as Concertmaster and I treasure him as a fine musician and very good violinist."
After leaving Valencia, Stefan is playing as a guest Concertmaster and Leader in different european orchestras. He performed in important concert halls, such as: Philharmonie Berlin, Concertgebouw Amsterdam, Musikverein Vienna, Rudolfinum Prag, Palao de la Musica Catalana Barcelona, Tonhalle Zürich, Victoria Hall Genève, Suntory Hall Tokyo, Grand Theater Shanghai, Center for performing Arts Beijing, National Cultural Center Washington and many others. He is playing a violin by J.B. Vuillaume