2015 Judges & Master Class Instructors

Sarah Chang, Violin

Heidi Castleman, Viola

Anthony Ross, Cello

(photos and bios coming soon)


2014 Judges & Master Class Instructors

Karen Dreyfus, Viola

John Sant'Ambrogio, Cello

Donald Weilerstein, Violin



Karen Dreyfus joined the faculty of the University of Southern California in 2013.  She also teaches at the Manhattan, Mannes and Juilliard School.  A graduate of the Curtis Institute of Music, Ms. Dreyfus' major viola studies were with Leonard Mogill, Michael Tree and Karen Tuttle.  She is a prizewinner of the Naumburg, Tertis, Washington and Hudson Valley Competitions, and has toured worldwide with the Orpheus Chamber Orchestra, Musicians From Marlboro and the New York Philharmonic.  Karen Dreyfus has received a National Endowment for the Arts Solo Recitalists Award.  In her recording "Romanze", she was cited as "a terrific player with impeccable technique and intonation, beautiful tone, and real musicianship."  Composers Ezra Laderman, Elizabeth Brown, William Thomas McKinley and George Tsontakis and others have written works for her.  A recording artist in both solo and chamber music, Ms. Dreyfus has recorded for Bridge Records, MMC, Parma, Cala and other recording companies.  Recent recordings are of the Walton Viola Concerto, Mozart's "Sinfonia Concertante", the Martinu Madrigals, a Dvorak CD, Strauss, Turina and Dohnanyi.  Ms. Dreyfus is a founding member of the Lyric Piano Quartet and the Amerigo Trio.




Donald Weilerstein has concertized extensively throughout the world as a soloist and chamber musician.  For twenty years (1969-89) Weilerstein was the first violinist of the renowned Cleveland Quartet, with whom he toured the world.  His recordings with the quartet can be heard on the RCA, Telarc, CBS, Phillips, and Pro Arte labels.  These recordings have earned seven Grammy nominations and won Best of the Year awards from Time and Stereo Review.  Weilerstein has taught and performed at such major American and European music festivals as Caramoor, Tanglewood, Aspen, Marlboro, Mostly Mozart, Salzburg, Luzern, Verbier, Ishikawa, Keshet Eilon, "Chamber Music Encounters" sponsored by La Cite de la Musique and the Paris Conservatory and many more.  He regularly teaches and performs at the Steans Institute in Ravinia, the Yellow Barn Music Festival, and at the Perlman Music Program.  He also performs as a duo recitalist with pianist Vivian Hornik Weilerstein.  Their discography includes the complete works of Ernest Bloch for violin and piano, and the Janacek, Dohnanyi, and Enescu Sonatas for Arabesque, as well as the complete Schumann Sonatas for Azica Records.  Weilerstein is very active as a member of the highly acclaimed Weilerstein Trio, which is in residence at the New England Conservatory of Music.  A former professor of violin and chamber music at the Eastman School and the Cleveland Institute of Music, Weilerstein is currently on the faculty of the New England Conservatory of Music and the Juilliard School.  





John Sant'Ambrogio has enjoyed an illustrious career as a cellist in top orchestras, chamber music ensembles and as a pedagogue for over five decades.  Appointed Principal Cello of the Saint Louis Symphony Orchesta in 1968 after being a member of the Boston Symphony Orchestra for nine years, Mr. Sant-Ambrogio has served as Principal Cello of such orchestras as the Casals Festival (Puerto Rico), Grand Teton Music Festival (WY), Lancaster Festival (OH) and the Seventh Army Symphony (Europe).  In 1987, he founded and was the first Artistic Director of Strings in the Mountains in Steamboat Springs, Colorado.  His discography includes chamber music and orchestral recordings on the TELARC, RCA, IMG and VOX labels.  Mr. Sant'Ambrogio studied with Leonard Rose, Paul Olevsky and Diran Alexanian and has passed on these pedagogies while on the faculties of Washington University, the St. Louis Conservatory and Boston University .  His students have won jobs in major symphony orchestras, including the Boston Symphony Orchestra, the Chicago Symphony and the Saint Louis Symphony Orchestra.  Retiring from the SLSO in 2005, he moved to Steamboat Springs to pursue his love of skiing, hiking, cycling and photography.  Still a very active chamber musician and teacher, he founded the Generations Piano Trio in 2005 with violinist Dmitri Pogorelov and pianist Judith Lynn Stillman.  Mr. Sant'Ambrogio continues to perform throughout the country with his trio and, to his delight, with his daughters Stephanie, violinist, and Sara, cellist.