Doug Machiz

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A native of Washington, DC, cellist Doug Machiz resides in Oakland where he is co-founder, manager, and cellist of Friction Quartet.  With Friction, Doug is extremely fortunate to perform old and new string quartets around the United States with amazing musicians.  He is also grateful for the many opportunities Friction has to inspire young people with the power of music.


In addition to his work with Friction Quartet, Doug is an active free-lance musician and teacher.  He has participated in the Banff Chamber Music Residency, Deer Valley Music Festival with the Muir Quartet, the St. Lawrence Emerging String Quartet Program, Bang on a Can Summer Festival, Fontainebleau Conservatoire Americain in France, and the Zephyr International Chamber Music Course and Festival in Italy.


While beginning his cello studies at the late age of 14, he was able to progress quickly thanks to his previous experience studying classical and jazz piano, bass guitar and classical and electric guitar. He was fortunate to study with Mike Reynolds at Boston University despite his limited experience. He went on to earn a Masters degree from UT Austin with Bion Tsang, and a Professional Studies Diploma from the San Francisco Conservatory where he studied with Jennifer Culp.


In his spare time, Doug is an avid yogi, road cyclist, backpacker, traveler and weather geek. Since moving to San Francisco he has become severely addicted the amazing coffee.  He’s a big fan of Haruki Murakami novels and films by Richard Linklater, Wes Anderson, and PT Anderson.

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Otis Harriel


Violinist Otis Harriel earned his Bachelors Degree from the San Francisco Conservatory of Music in Spring 2013. He began his studies with Rob Diggins in his hometown of Arcata, CA. Under his teacher’s guidance he began performing with many local orchestras and chamber ensembles including the Eureka Symphony and Humboldt State Symphony. He attended the Sequoia Chamber Music Workshop, Idyllwild Chamber Music Program, Sphinx Academy of Music. Mendocino Music Festival and Castleton Festival.


Otis studied with Wei He at the San Francisco Conservatory of Music. He has participated in master classes with the first violinist of the Shanghai Quartet, Weigang Li, William van der Sloot, and Pinchas Zukerman. While at the conservatory he developed his love of chamber music under the guidance of coaches including Mark Sokol, Jennifer Culp, Jean-Michel Fonteneau and Jodi Levitz. He has a passion for reading, baking and Haydn.


Kevin Rogers

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As a young violinist, works of composers such as Penderecki, Boulez, and Berio captivated Kevin Rogers long before his first exposure to even a complete Beethoven Symphony, setting the groundwork for his passionate career in contemporary classical music. He is the founding violinist/violist of Nonsemble6, a contemporary Pierrot Ensemble based in San Francisco. As part of this group he has performed at the Astoria Music Festival as guests-artists-residence, at Universities throughout the country, in unorthodox venues through Classical Revolution SF, and at the Kennedy Center.


He began his solo career at sixteen in South Carolina. His most recent solo performances have included the Lou Harrison Violin Concerto at the Hot Air Music Festival in San Francisco, and a premier of Manly Romero’s concerto for two violins and two trumpets titled “Doppelgaenger” with the Blue Print Series under the Baton of Nicole Paiement.


Kevin Rogers recently graduated from the San Francisco Conservatory of Music with a Masters degree in Violin Performance. While there he received the award for Violin in New Music, and the award for Violin in the String departments. He studied with Bettina Mussumeli and worked closely with Jennifer Culp, Jodi Levitz and Mark Sokol. Having grown up on a farm, you can occasionally hear him slip into a southern accent after many hours of practicing or in moments of excitement.

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Rachyl Martinez


Throughout her career, Rachyl Martinez has sought out every possible chamber music opportunity - attending selective chamber music festivals such as Kneisel Hall and Norfolk, founding Ensemble Elevate in New York, playing at the Colburn Chamber Music Society with Scott St. John and Augustin Hadelich, and becoming a member of Mimesis Ensemble - with whom she performed at Carnegie Hall and the United Nations, and recorded the album Dancing Circles In the Night. Rachyl also attended the prestigious new music festival Klangspuren Schwaz - Tiroler Festival für Neue Musik in Tyrol, Austria.


As a soloist, Rachyl has earned top prizes at the International Hugo Kauder Competition for Viola, the Pasadena Showcase House Instrumental Competition, and the concerto competitions at Wilmington Symphony Orchestra and University of North Carolina School of the Arts (UNCSA) - where she earned her bachelor's degree on full scholarship with Sheila Browne. The Hugo Kauder Society funded Rachyl's professional music video of Kauder's Kleine Suite für Viola Solo, available on YouTube. Rachyl was also a member of the San Diego Symphony from 2016-17, having earned the position while still attending the Colburn Conservatory for her master's degree with Paul Coletti. 


Rachyl's other musical passion is teaching the Suzuki Method, particularly to young children. Rachyl recently launched the in-person/online hybrid Morph Suzuki Academy - but she has maintained her own Suzuki studio since the early 2000s. She earned her formal Suzuki certificate at the School for Strings with Allen Lieb in 2020. Prior to this, Rachyl was personally mentored in the Suzuki Method by Shelley Beard at the Music School of Delaware (MSD). Rachyl has also taught at MSD Suzuki Day, the Greenwich Suzuki Academy, the Brooklyn Music School, Porterville Summer Strings Academy, and as artist-in-residence at the Bellingham Festival of Music. Rachyl has a special interest in psychology, and particularly enjoys teaching the neurodiverse. 


Rachyl lives very happily with her husband, renowned bassist Marlon Martinez, and their two kitties, Earl Grey and Coffee Cake. Rachyl is passionate about normalizing mental health, and is an #ActuallyAutistic advocate. You will usually find her watching her favorite shows on repeat, spending time with friends, watching movies, or drinking coffee.