Heidi Trefethen

Audio Engineer, Musician, Composer, and Professor

Heidi is a mix engineer and immersive sound designer known for translating artistic intent into powerful, precision-built mixes. She works fluently across stereo and spatial formats, delivering clarity, depth, and emotional impact. As a professor, Heidi teaches Advanced Mixing, Intro to Mixing and immersive audio at the San Francisco Conservatory of Music, mixes live at SFJAZZ and The Freight, and collaborates with Women’s Audio Mission to elevate underrepresented voices in music. A classically trained French hornist and a GRAMMY-voting member, she brings both technical authority and a musician’s ear to every mix.