The String Quartet of Northern Virginia LLC is an Alexandria, Virginia based group that features an extensive roster of professional musicians from the Washington DC metro area.

Founder/Violinist Stephanie Sims Flack and Business Manager/Cellist Diana Flesner orchestrate each performance with meticulous care and attention to detail to ensure every client’s vision for their event is beautifully executed.

We provide the highest level of performance, current and traditional repertoire and an elegant atmosphere/ambiance for any special occasion. Our core ensemble is comprised of two violinists, a violist and a cellist. We collaborate with additional artists as requested by our clients including trumpet, flute, guitar, harp, soprano and bass (other instruments & vocalists are available by arrangement-advance notice required).

Stephanie Sims Flack, Violinist and Artistic Director/Founder

sflackphoto credit: Shannon T. Flack Photography

Violinist Stephanie Sims Flack enjoys a busy performing schedule as a freelance chamber and orchestral musician in the Washington DC metro area. She is excited to be serving as Paragon Philharmonia’s Associate Concertmaster and Board President for its third season as Ensemble-In-Residence at Grace Episcopal Church in The Plains, Virginia and is one of the co-founders of the orchestra. Additionally, she appears on the Latin Grammy Nominated album “Tango of the Americas” as 1st violinist with Pan American Symphony Orchestra and traveled to the 2018 International Tango Festival in Medellin, Colombia where PASO was the only US orchestra invited. Other national and international orchestral engagements have included the American Pops Orchestra, Cambridge (England) Philharmonic, Ely (England) Sinfonia (Leader), Arizona Opera and Baton Rouge Symphony.

Stephanie is in demand as a workshop clinician and performer, has co-directed of the Greater Washington Suzuki Institute and has served as Board Chair for the Suzuki Association of the Greater Washington Area. She received her Bachelor of Music degree in violin performance from Louisiana State University and Master of Arts degree from Indiana University. She has also continued her education at the bi-annual Starling-Delay Juilliard Symposium on violin studies in New York.

She has directed and performed on tours to England, Italy, Austria and Germany with Washington Preludio and looks forward to upcoming tours planned to England the summer of 2024. Stephanie co-teaches and manages Northern Virginia Preludio Strings and maintains a private violin studio at her home in Alexandria, Virginia where she resides with husband, Sean, daughters, Emily and Shannon and dogs Winnie, Bandit and Pepper.


Diana Flesner, Cellist and Business Manager

flasnerphoto credit: Britt Olsen-Ecker

Diana Flesner, cellist, received her DMA from the University of Illinois, where she studied with Brandon Vamos. Originally from Gettysburg, Pennsylvania, she received her MM from San Francisco Conservatory and her BA magna cum laude from Middlebury College with a double major in Music and Russian Language/Literature. Her principal teachers have included Bonnie Hampton, Jean-Michel Fonteneau, and Dieuwke Davydov.

Diana was a member of the Cervantes String Quartet for two years, which in addition to regular concerts and recitals, performed live for WILL-FM, gave the American premier of a quartet by Edward Top, and served as Quartet in Residence for Strings in the Mountains summer music festival.

While at the University of Illinois she was a member of the Graduate String Quartet and while in San Francisco she was a member of the Bravel Piano Trio. She has participated in Manchester Music Festival and The Quartet Program at Bucknell and has played in masterclasses or coached with members of the Pacifica, Miró, Miami, Kocian, Tokyo, Juilliard, Tákacs, and Kronos Quartets. She served as principal cellist for the University of Illinois Symphony Orchestra and has played with Baroque Artists of Champaign-Urbana, The Prairie Ensemble, Opera Illinois, Champaign-Urbana Symphony, Peoria Symphony, Illinois Symphony, Annapolis Symphony Orchestra, and Fairfax Symphony.