Born in Hong Kong to Swiss and American parents, Theodor spent his early years in New York City before his family relocated to Switzerland. In the Jura mountains overlooking Lake Geneva he developed a love of nature that would underscore much of his later writing. When not running around the woods Theodor spent most of his time listening to music and playing his violin in his attic room, practicing archery in the garden, and devouring his mother's Chinese food. At 15 he decamped to Vienna for a term and discovered the joys of 3€ standing tickets at the opera (unfortunately the secret's out now and you'd be lucky to get one for less than 10€).
When he was 18, Theodor moved to the UK to study at the University of Cambridge. There he won prominent positions in various ensembles including the university's Symphony, Chamber, and Opera Society orchestras, and was named Cambridge University Symphony Orchestra's Principal Conductor during the academic year of 2011-12. Upon graduating he was awarded the Donald Wort Award (for Greatest Proficiency in a Final Recital) and the Royalton Kisch Prize for Music (for the highest final examination mark of his college).
The next step in his musical journey took him to London and the Royal Academy of Music. With support from the Leverhulme foundation he studied violin with Maurice Hasson and conducting with Ray Holden, received additional coaching from members of the Britten Sinfonia, the BBC Philharmonic and the Royal Liverpool Philharmonic, performed in masterclasses for Maxim Vengerov and Levon Chillingirian, and played as a section principal or co-principal for many distinguished conductors including Semyon Bychkov, Christophe von Dohnanyi, Edward Gardner, Thierry Fischer, and Jane Glover. Theodor graduated from the Academy with Distinction in 2014.
In recent years, Theodor's shared the stage with some of the world's most exciting artists including Zubin Mehta, Valery Gerghiev, Ivan Fischer, Esa-Pekka Salonen, Antonio Pappano, Leonidas Kavakos, Pinchas Zukerman, Renaud Capuçon, Janine Jansen, and many others. Now firmly based in London, he is a founding member of the Cardinal String Quartet, Rotating Principal Violin II of United Strings of Europe, and Deputy Principal Violin II with the English National Ballet Philharmonic. He’s been featured as a concerto soloist with the Ensemble Eroica, Silk Street Sinfonia, and Cambridge University Symphony Orchestra, and has performed as section principal/sub-principal with Welsh National Opera, the Royal Philharmonic Orchestra, Royal Northern Sinfonia, and the City of Birmingham Symphony Orchestra. He currently plays an 1865 Baldantoni generously lent to him by the Harrison-Frank Foundation.
When not making music, Theodor enjoys writing and has received accolades for both his poetry (Strokestown International Poetry Festival) and his prose (1000 Word Quarterly, Litopia Pop-Up Submissions). He published his first novel, The Winter Wilds, in 2020.