Founding member of the Guarneri String Quartet, he has played in major cities throughout the world. Mayor Ed Koch presented the Quartet with the New York City Seal of Recognition, an honor awarded for the first time. He has appeared as violin and viola soloist with the Philadelphia, Los Angeles and other major orchestras. He has recorded over ninety five chamber music works. He has appeared on the Today Show and the first telecast of Chamber Music Live from Lincoln Center. He serves on the faculty of the Curtis Institute of Music, the Juilliard School, the Manhattan School of Music, Bard College and the University of Maryland.