His international career as a chamber musician began with the Marlboro Music School and Festival (in the U.S) where he played alongside Rudolf Serkin, Paul Tortelier, David Soyer, and Isidore Cohen.
Since then he appeared at the Georges Enesco festival (Bucarest), Kuhmo (Finland), BBC Proms Chamber Music London), at the Schubertiade (Austria) alongside Joshua Bell, Jeff Cohen, Martin Fröst, Isabelle Faust, Alban Gerhardt, Marie Hallynck [fr], Nelly Decamp [fr], Hervé Joulain, Patrick Messina, Viktoria Mullova, Nicolas Stavy, Alexandre Tharaud, Cédric Tiberghien, the Danel Quartet...
[3] He participates in the creation of new scores, such as those of Michiru Oshima (Concerto for viola "Voix de la Vie"[4]), Marc Bleuse, Edison Denisov, Antoine Duhamel, Thierry Pecou, and Ian Wilson.
Pierre Lénert won the Académie Charles-Cros prize at EMI and the Diapason d'Or of the year 2000 at Arion.
Pierre Lénert played a viola by Jean-Baptiste Vuillaume dated 1865 from 1993 until 2023 when it was sold to the Anne-Sophie Mutter Foundation via Tarisio private sales.