Schönfeld gave his first concert in his native Poland at the age of 19 before going to Israel to become a pupil of the Bartók disciple Ilona Vincze-Kraus.
After winning several national and international prizes, including one with the Jerusalem Symphony Orchestra and first prize in the Leo Kestenberg competition, Schönfeld made his debut with the Israeli Radio and Television Orchestra playing Rachmaninov's Paganini Variations.
In November 1972, at the invitation of the French government, Schönfeld undertook study with Vlado Perlemuter, Yvonne Lefébure, Arthur Rubinstein, and Marcel Ciampi in piano, Henryk Szeryng in chamber music, and Nadia Boulanger and Alexandre Tansman in composition.
In addition to his creative work, Schönfeld is artistic director and founder of the European Pianistic Research Institute of Maastricht (EPRIM) and artistic adviser to the Anglo Dutch Piano Platform and the Académie Pianistica of the Maastricht Municipal Theatre.
Among Schönfeld's compositions for piano are Animato, Sphinx, Labyrinthe, Ombres and Tango-Etude (all published by Max Eschig/Durand), Agitato and Jeu (Henry Lemoine), Légende (Editions Combre), and Sonatine Mediterranean.