Tomás Brantmayer is a Chilean composer based in London. His music explores themes such as Indigenous cultures, folk religion, soundscape, the natural environment, and social justice, using them as lenses through which to reflect on South American territory and identity.

His works have been performed by ensembles including the National Symphony Orchestra of Chile, the Santiago Philharmonic Orchestra, the Camerata Salzburg, the Britten Sinfonia, the National Symphony Orchestra of Paraguay, and the Explore Ensemble, in venues such as the Mozarteum Grosser Saal, the Kulturpalast Dresden, the National Opera of Chile, and the Cité de la Musique, among others.

In 2019, he was resident artist at MacDowell in the United States, where he worked on a cantata commissioned by the National Symphony Orchestra of Chile. In 2021, Brantmayer made his debut at the Salzburg Festival with his orchestral work Canción de cuna para Fuegia Basket. That same year, he received the Carlos Riesco Composition Prize from the Chilean Academy of Fine Arts, and in 2024, he was awarded the Pulsar Award as 'Best Classical Musician of the Year' for his orchestral work Morbus Sacer. The following year, he served as Composer-in-Residence with the Concepción Symphony Orchestra for its 2025 season.

Tomás holds a Master of Composition degree from the Royal College of Music, where he studied with Kenneth Hesketh, supported by an RCM Scholarship, the Big Give, and an Ibáñez Atkinson Foundation scholarship. He has also participated in masterclasses with composers Mark-Anthony Turnage, Colin Matthews, and Marco Stroppa.

Alongside his work as a composer, Tomás is an active bell ringer and a member of the Santiago Bell Ringers and the Middlesex County Association and London Diocesan Guild of Church Bell Ringers. Through these associations, he has rung bells in Chile, Spain, Italy, and the United Kingdom.