The NYSE includes 4 musicians who have been hand-picked by our director TO provide mentorship to their younger counterparts in the orchestra.  the nyse "mentors" are particularly gifted in their field, and have a broad range of experience that encompasses leading the finest orchestras in the world as well as their roles as soloists and chamber musicians.  Our NYSE mentors help to provide leadership in the ensemble, and to continually advocate the development of our musicians who join us each year.  

Violinist GEORGY VALTCHEV has appeared as soloist, recitalist and chamber musician throughout the United States, Europe and Asia.

He has been heard as soloist with orchestras in Bangor, Baton Rouge, Boston, Chicago, Dallas, Miami, New York, New Jersey, in his native Bulgaria, and throughout Japan.

As chamber musician Georgy Valtchev has appeared in New York's Carnegie Hall, Allice Tully Hall, 92 Street 'Y', Kennedy Center in Washington DC, Chicago's Cultural Center as well as in renowned venues in abroad, such as the Wigmore Hall and the Barbican Center in London, the Royal Carre Theater in Amsterdam, and the National Arts Center in Beijing and the Guangzhou Opera House in China among others. He has appeared in international music festivals such as Mostly Mozart at Lincoln Center, Beethoven Festival at Bard College, Sofia Music Weeks, Varna Summer and Apolonia in Bulgaria,  Bastad Chamber Music Festival in Sweden, and Great Mountains Music Festival in Korea.

Mr. Valtchev has appeared as Guest Concertmaster with the London Philharmonic Orchestra including leading the orchestra during the Queen Elizabeth's Diamond Jubilee celebration, an event which was broadcast all over the world. He is also Guest Concertmaster of the Madrid Symphony Orchestra at the Royal Opera in Madrid.

His performances have been broadcast on radio and television stations throughout the world, including BBC, WGBH, Danish Radio, and Bulgarian National Radio and Television. He has recorded several CD's for the Bulgarian classical label Gega New, including the complete Sonatas and Rhapsodies for Violin and Piano by Bela Bartok with his wife and chamber music partner, pianist Lora Tchekoratova. Mr. Valtchev is a member of the Mark Morris Dance Group Music Ensemble and a founding member of Bulgarian Concert Evenings in New York.

Born in Plovdiv, Bulgaria, Georgy Valtchev began his violin studies at the age of six and gave his first performance with orchestra six years later at the Music academy of his native city. He received his basic music education first at the Plovdiv Music School, and then at the State Music School "Lubomir Pipkov", Sofia. At age sixteen, he won the Grand Prize and the Prize for best performance of a Wieniawski composition at the "Kocian" International Competition in the then Czechoslovakia. In 1992 Georgy Valtchev moved to the United States as a scholarship student of Dorothy Delay and Masao Kawasaki at The Juilliard School in New York, where he earned his Bachelor's and Master's Degrees.




Recipient of the SUNY Chancellor's Award for Excellence in Teaching, acclaimed Canadian violinist, MAUREEN YUEN, has performed, taught and adjudicated on five continents. Ms. Yuen has been on the faculty of the School of Music at the State University of New York at Fredonia since 2004, where she maintains a full studio of undergraduate and graduate violinists.  Recent projects include concerts of the Beethoven Violin Sonata Cycle and complete Brahms Sonatas with pianist Fr. Sean Duggan, as well as the complete Prokofiev Sonatas. Her interest in new music has led to co-founding the annual composition competition at SUNY Fredonia in 2011 with Robert Deemer, as well as being a featured performer at the Composer’s Workshop at the annual New York State School Music Association Winter Conference. 

Balancing her busy performance schedule, Ms. Yuen is a devoted violin and viola teacher and chamber music coach. She is a member of the College of Examiners of the Royal Conservatory of Music and has adjudicated for the Hong Kong Schools Music Festival. She is also a senior adjudicator and strings specialist for the Royal Conservatory Music Development Program (formerly the Carnegie Hall Achievement Program). In addition, she has served on the summer faculties of the Schlern International Music Festival in the Italian Alps, National Music Festival in Maryland, Music/Meadows/Mountains in Washington and the Rocky Ridge Music Center in Colorado as Artist/Faculty.

WILLIAM HAKIM, violist, praised for his "warmth of tone and musicality" (Leipziger Volkszeitung), enjoys playing, writing and arranging music in many styles. He has recorded for various artists including Renee Fleming on the Decca label, HBO, served as Billy Joel's violist for his Madison Square Garden residency, had numerous tour and tv appearances with Josh Groban, Boyz II Men, Branford Marsalis, and Idina Menzel among others. Mr. Hakim is a member of the Iris Orchestra in Memphis, the le Poisson Rouge Ensemble (eLPR), which recently made its recording debut for Deutsche Gramaphon, the Orion Music Ensemble, principal of the New York Symphonic Ensemble, the Glens Falls Symphony, String Orchestra of New York City, and a former member of the Hyperion String Quartet, and also plays with the New Jersey Symphony, the Princeton Symphony, Albany Symphony, and the Chamber Orchestra of Philadelphia. In a jazz setting he's played with Branford Marsalis, Gene Bertoncini at the Jazz Standard in NYC, and with members of the Village Vanguard Jazz Orchestra. He recently made arrangements of traditional African music for the United Nations, and is working on an album of original compositions for solo viola. He studied with John Graham at the Eastman School of Music, Samuel Rhodes at the Juilliard School, and with Paul Neubauer at the Graduate Center of CUNY where he is pursuing a doctorate and researching improvisation methods for classically trained musicians. Mr. Hakim has taught at Brevard Music Center, the Point Counterpoint Chamber music festival, Seton Hall University, and is currently on the faculty of Skidmore College.


SYCIL MATHAI, trumpet, is part of various directions of contemporary and experimental chamber music in New York City. The New York Times called him a "terrific trumpeter".  From classical to experimental genres, his work spans to ensembles like Extension Ensemble, The Knights, Orchestra of St. Luke’s, Argento New Music, Dave Sanford's big band Pittsburgh Collective, American Composers Orchestra, Ne(x)tworks, artists Carter Burwell, Butch Morris, and the dance companies of Merce Cunningham, Mark Morris Dance Group, Nai-Ni Chen, and movie directors Andy Kaufman, and The Coen Brothers. He has recorded for RCA, PBS, CBS, EA Sports, Summit Brass, Albany Records, New World, and Sirius Satellite Radio.

Sycil is a graduate of Juilliard as a student of Mark Gould, and of Texas Christian University as a student of Steve Weger. Recently, Sycil served as guest Principal Trumpet for the Saint Paul Chamber Orchestra’s 2014 and 2015 seasons, recorded with Yo-Yo Ma, and toured the U.S. with The Knights orchestra accompanying Gil Shaham. He served as Co-Principal Trumpet of the Malaysian Philharmonic Orchestra during April-May of 2016, and also made a solo appearance on the NBC television show Late Night With Seth Meyers.  

In addition to serving as a NYSE Mentor musicians, Sycil is also the contractor for the NYSE for which he helps coordinate auditions, website design, and party planning.