Isabel Thiroux

Interim Executive Director


Isabel Thiroux has been with the American Youth Symphony since she first joined the viola section in 2001. After seven years in the orchestra, she “graduated” to working in the office, becoming Orchestra Manager in 2010 and Director of Orchestra Operations in 2015.

Ms. Thiroux studied viola at CSU, Long Beach with LA Philharmonic violist John Hayhurst and maintains an active career as a freelance violist performing regularly around the Los Angeles area.

Tim Kopacz

Operations Specialist


Tim Kopacz is an artist, administrator, and producer at several Los Angeles area non-profit organizations. He is an active educator in the film and TV community, as well as a performer himself. He has degrees from both Boston College and Brown University.

Mark Gutierrez

Community Educator & Share-A-Stand Lead Instructor


Mark Gutierrez is a Los Angeles born upright/electric bassist, vocalist, composer, lyricist, and producer. He has been performing and creating music in the greater Los Angeles area for over ten years with a variety of ensembles, ranging in genre from Latin music, to Jazz, to Classical/Orchestral, to Hip Hop and more. An alumni of the American Youth Symphony, Mark now works with AYS’ Share-a-Stand program to bring advanced music training to students in LAUSD.

Sarah Bunch

Orchestra Management Fellow


Sarah is a violinist based in the LA County area. She joined AYS as a player in 2018 and took on the role of orchestra management fellow in 2021. She is also an active member of another orchestra in the Antelope Valley called West Coast Classical, where she serves on the board of directors, directs one of the beginning strings programs, and sits as concertmaster of their Symphonic Orchestra. Alongside her orchestral responsibilities and freelance work, Sarah is a private violin instructor.