Pohjonen completed his Master of Music degree in the Performing Arts programme of the Sibelius Academy in 2000, where he studied piano under Meri Louhos and Erik T. Tawastsjerna. He has participated in the master classes of Eero Heinonen, Dmitri Baskirov, Lev Naumov, Murray Perahia and other distinguished teachers, and also studied composition under Eero Hämeenniemi and Paavo Heininen.
Joonas Pohjonen has performed as a soloist with several orchestras in Finland, including the Helsinki Philharmonic Orchestra, the Lahti Symphony Orchestra and the Finnish Radio Symphony Orchestra. He has also given recitals at notable venues abroad, including Stockholm, Paris and Zurich.
His chamber music performances have taken him to such distant locations as Korea and Japan.
Joonas Pohjonen has lectured in pianism and accompaniment at Metropolia University of Applied Sciences in Helsinki since 2001.