Pianist Robert Koenig is well known as a chamber music player, backing many of the world's top violinists. Koenig is also active as an educator and serves as professor and head of collaborative piano at the University of California at Santa Barbara. In 2001, he backed John Rojak on the album The Romantic Bass Trombone. He commissioned Lowell Liebermann's Trio for flute, cello and piano, Op. 87, and premiered the work at the National Flute Association Convention in Nashville. Koenig has backed such major violinists as Hilary Hahn and Sarah Chang, and he has had ongoing associations with Elmar Oliveira and the late Aaron Rosand. Koenig's 2006 recording of William Primrose's transcriptions for viola and piano, with violist Roberto Díaz, earned a Grammy nomination. In 2022, Koenig backed cellist Jennifer Kloetzel on a recording of Beethoven's complete sonatas for cello and piano.