Theocharis Papatrechas is a Greek composer, electronic musician, and music educator, currently finishing the PhD program in composition at the University of California, San Diego (UCSD) in the studio of Rand Steiger.

He holds degrees in composition from the Ionian University (BA) and the Eastman School of Music (MA). In 2010-11, he attended the Sibelius Academy in Finland. For his studies, he has received scholarships from the American Hellenic Educational Progressive Association, and the Onassis, Lilian Voudouri, and Gerondelis Foundations.

During his time at Eastman, Theocharis taught privately composition to non-majors as well as assisted the classes of the Advanced Electronic Music and Orchestration. At UCSD, he taught Music Theory, Counterpoint, History of 20th Century Music, Contemporary Music, Symphonic Music, and History of Electronic Music. Between 2018-2020, Theocharis has been working with Professor Lei Liang on several 3D audio installation projects at the 32-channel Spatialization Lab of the Qualcomm Institute of Technology in collaboration with a group of scientists from the Institute of Oceanography. Finally, in Winter 2020, he instructed the undergraduate Introduction to Composition course. 

Theocharis has participated in several renowned venues and master-classes such as, among others,  IRCAM's ManiFeste Academy, initially in the composition program with ensemble Intercontemporain in 2018, and then in the electronic music workshop AIME (Atelier d'Interprétation des Musiques Électroacoustiques) in 2019, FORUM with Nouvel Ensemble Moderne, SEAMUS 2019 at Berklee, Shanghai New Music Week with Mivos Quartet, VIPA 2016 with the [Switch~ Ensemble]Mixtur Festival 2017 with Proxima Centauri, Workshop for Young Composers in Tchaikovsky City, Etchings Festival with ECCE, IDEA Young Composers Workshop with Divertimento ensemble. In those contexts, he has received instruction from, among others, Chaya Czernowin, Brian Ferneyhough, Fred Lerdahl, Rebecca Saunders, Philippe Leroux, Franck Bedrossian, Georg Friedrich Haas, Beat Furrer, Francesco Filidei, and Stefano Gervasoni.

Finally, since 2016, Theocharis, in collaboration with Michele Bianchini and the Italian new music ensemble Suono Giallo, is running ilSUONO Contemporary Music Week, a summer composition academy, which takes place annually in Città di Castello, Italy. ilSUONO forms a context for young composers to gather, create, learn, discuss, share, collaborate, and interact with leading composition figures and highly skilled instrumentalists.

Theocharis's music has been recorded by ArsPublica. His scores are published by Babel Scores.

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