Theodosia Roussos is a Greek Cypriot American Soprano, Oboe/English Horn player, Improviser, and Composer internationally. She has performed with orchestras including the Los Angeles Philharmonic, Boston Philharmonic, Tucson Symphony and studio orchestras at Warner Brothers, Sony, EastWest Studios, and Coachella. She has recorded several projects with composer Emile Mosseri, playing oboe, English horn, voice and contributing original improvised melodies for the film The Last Black Man in San Francisco, oboe for Amazon Prime show Homecoming, and as the soprano soloist for Miranda July’s film Kajillionaire.

She starred as Maria in West Side Story with USC, and Songfest in 2018 with conductor Michael Barrett and narrator Jamie Bernstein. This season's engagements have included premieres with The Industry's Sweet Land Opera, New Opera West, and Synchromy.

Theodosia’s passion for contemporary and improvised music has led to solo vocal and oboe performances at Pafos 2017 European Union Cultural Capital, Banff Center, Bang on a Can Festival, soundSCAPE, and Songfest with composers including David Lang, Julia Wolfe, Butch Morris, John Harbison, among many more. Upcoming in 2021, Theodosia is looking forward to performing the premiere of her new opera Polymnia, commissioned by the UCLA Stavros Niarchos Center for the Study of Hellenic Culture, scoring a documentary for Netflix, headlining as the Soprano/Oboe soloist in Dots+Loops Nonstop Festival in Australia, and playing oboe/English horn for Spoleto Festival USA.

Theodosia is a frequent guest lecturer at her alma maters USC, UCLA, and Oberlin Conservatory.