 The modest upstairs room he coached in contained photographs covering every wall from all the quartets that he mentored – a real "wall of fame".Lehner was widely regarded as one of the greatest living experts of the interpretation of chamber works by Alban Berg, Anton Webern, Arnold Schoenberg, and Béla Bartók, having been involved in the premieres of several of such works during his time with the Kolisch Quartet.As a member of the quartet, Lehner gave the premieres of Berg's "Lyric Suite," Schoenberg's Third and Fourth String Quartets, Bartók's Fifth Quartet and Webern's Second Quartet.