He has won prizes at the International Competitions in Budapest (1975) and Munich (ARD) in 1976, and in 1982 won first prize and the Ernst Wallfisch Memorial Award at the International Naumburg Competition New York
He has appeared as a soloist at venues such as Carnegie Hall, Concertgebow Amsterdam and Wiener Musikverein. He has performed with numerous leading orchestras including the Chicago, Berlin and Vienna Symphony, the Bavarian and Finish Radio Symphony Orchestras, and with conductors such as Claudio Abbado, Horst Stein, Edo de Waart, Andrew Davies and Sylvain Cambreling.
He has been invited to many of the major international music festivals.
His chamber music partners have included Jessey Norman, Andras Schiff, Oleg Maisenberg, Elisabeth Leonskaja, Pierre-Laurent Aimard, Gidon Kremer, Benjamin Schmid, Thomas Zehetmair, Joshua Bell, Tabea Zimmermann, Natalia Gutman, Boris Pergamenschikow, Steven Isserlis, Sabine Meyer, the Juilliard String Quartet and the Hagen-Quartett.
From 1972 – 1979 he was a member of the Franz-Schubert-Quartett, Vienna (first.prize at the competition of the European broadcast cooporations in Stockholm in 1974);
subsequently he became a founder member of the Vienna String Sextet (1979 – 2004), which performed worldwide and recorded several CDs for EMI and pan classics.
Since 1983, Thomas Riebl has been a professor at the University Mozarteum Salzburg and has
given numerous master classes worldwide. Many of his students won international competitions and became professors at music universities or members of leading orchestras, string quartets and other chamber music groups.
He is artistic director of the Internationale Sommerakademie Bad Leonfelden, Austria and has recorded for RCA, pan classics and Hyperion Records.