He received further important artistic impulses from Renate Kretschmar-Fischer and Elisabeth Leonskaja and attended master classes with Karl-Heinz Kämmerling, Maria João Pires and György Kurtág.
[1] His chamber music partners include among others Chloë Hanslip, Antje Weithaas, Sabine Meyer, Bryn Terfel and the Vogler Quartet.
From 2005 to 2010, Frantz dedicated himself to the cyclical performance of Ludwig van Beethoven's complete piano sonatas at Schloss Melschede (Sundern).
The Arp-Frantz Duo has recorded three CDs for the Genuin label, including the complete works for violoncello and piano by Felix Mendelssohn Bartholdy.
Frantz's latest solo recording with works by Robert Schumann was released on the Ars Produktion label.