Katie Backus

Originally from Rhode Island, Katie Backus is now based outside of Burlington, VT. A violinist and violist, she received a degree in music education from the University of Rhode Island, and
taught strings both in public schools and privately for ten years in New Hampshire before moving to Vermont.

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Matthew Sinno

Matthew Sinno, a Massachusetts native, joined the Dallas Symphony Orchestra as Associate Principal Viola during the 2021/22 season. Prior to that he served as Associate Principal and Acting Principal Viola with the Kansas City Symphony. Mr. Sinno has also performed with the New York Philharmonic, Philadelphia Orchestra and Saint Paul Chamber Orchestra as a substitute player.

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Xiaohan Sun

A native of Wuhan, China, violist Xiaohan Sun joined the viola section of the Dallas Symphony Orchestra in 2019. She began studying the violin at the age of four and transitioned to the viola at thirteen, drawn by its rich sound and expressive depth.

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David Sywak_Viola_Dallas Symphony

David Sywak

Hailed as the “best violist I ever heard!” by Timmy Hutchins (3rd grader, Lakewood Elementary) and described by The New York Times as “among the players,” David Sywak is a self-characterized discerning and in-demand viola player.

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Christine Hwang_Viola_Dallas Symphony

Christine Hwang

Christine Hwang joined the Dallas Symphony Orchestra as a member of the viola section in September of 2011. She began her musical studies at the age of five on the violin and piano.

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John Giesel - Dallas Symphony Orchestra

John Geisel

John Geisel, a graduate of Indiana University, has been a member of the Dallas Symphony viola section since 1984. He has also performed with the Dallas Chamber Orchestra, Dallas Bach Society, Fine Arts Chamber Players, Voices of Change and the Walden Piano Quartet.

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Valerie Diamond_Viola_Dallas Symphony

Valerie Dimond

Valerie Dimond is a graduate of The Juilliard School and former Assistant Principal Viola of the New Jersey Symphony. While in New York, she also played with the New York Chamber Symphony, the New York Pops and the Mostly Mozart Orchestra.

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Thomas Demer_Viola_Dallas Symphony

Thomas Demer

Tom Demer learned to play viola in southern Arizona. Earlier in his life he played in lesser orchestras, but in 1985 he was hired by Maestro Eduardo Mata to round out a 12-person viola section in the Dallas Symphony.

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Pamela Askew_Viola_Dallas Symphony

Pamela Askew

Pamela Askew has performed as a soloist with the Houston Symphony, the Philadelphia Bach Society and Concerto Soloists of Philadelphia. She is a graduate of the Curtis Institute and has served on the faculties of Georgia State University, Emory University and Agnes Scott College.

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Sarah Kienle_Acting Associate Principal Viola_Dallas Symphony

Sarah Kienle

Sarah Kienle began her viola studies at age seven in her hometown of Kalispell, Montana. After graduating in 2007 from the Walnut Hill School for the Arts in Natick, Massachusetts, she received her Bachelor of Music from the Colburn School in Los Angeles, California, in 2011, where she studied with Paul Coletti.

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