Jon Roskilly works as a trombonist and composer predominantly in the field of contemporary classical music. As a performer, he has worked with groups such as the London Sinfonietta, Klangforum Wien, Ensemble Garage and les trombones de bâle across Europe, and given world-premiere performances of works for ensemble and for solo trombone. He also appears regularly with the band Gabby Young and Other Animals, and is featured on their album One Foot in Front of the Other, as well as appearing on numerous other recordings. His compositions have been played in London, Basel and the Darmstadt Ferienkurse, and his arrangements have been featured in concerts by the Young Persons' Concert Foundation at the Roundhouse, London, as well as in the films 'Fifteen' and 'Acceptance' by Richard John Taylor.

Born 1987 in the south-west of England, Jon moved to London in 2007 to study at the Guildhall School of Music and Drama with renowned trombonists Simon Wills, John Kenny, Eric Crees and Chris Houlding. Having long been interested in contemporary classical music, he started to focus on this during his Batchelors degree, and was an active and enthusiastic performer in the school's contemporary music project, the Guildhall UBU Ensemble. After two years of working as a freelance musician and teacher in London, Jon moved to Basel, Switzerland in 2013, and graduated from the MA program at the Musik-Akademie der Stadt Basel in 2014 after studying with the trombonist and composer Mike Svoboda. He is active as a performer of new music for the trombone, giving premieres and working frequently with composers to help them write with a greater understanding of the technical aspects of this very flexible instrument.

As a composer, Jon studied in London with Kate Romano and Paul Newland, and with Caspar Johannes Walter in Basel. Among his many areas of interest are how processes interact with one another and the inherent theatricality of musical performance. Many of his pieces involve words, both as speech and song, and his interest in folk music has led him to make arrangements for various ensembles.