Following studies with Robert Saxton and Raymond Warren at the University of Bristol, and with Kurt Schwertsik at Dartington International Summer School, Owen Leech received a Polish Government Scholarship to study with Wlodzimierz Kotonski in Warsaw. His music has been widely performed in the United Kingdom and also in the USA, Canada, Spain, Poland and Japan by such distinguished performers as the English Northern Philharmonia and Elgar Howarth, the Schubert Ensemble, cellist Jamie Walton and the Composers Ensemble.

Recent commissions have focussed on chamber music for piano and strings - including a number, such as A deeper season and Into the ring of dancing shadows for the Schubert Ensemble, Schulz's Hourglass for Jamie Walton and Daniel Grimwood, and The wind in the ash, commissioned by cellist Yehuda Hanani for his New England chamber series. In 2006, Owen Leech gave the first performance of Dithyramb for flute and piano with the Slovak flautist Lenka Hrehorov√° in The Hague.

His music has been broadcast on BBC Radio 3, Australia's ABC Radio National, and WPRB Radio Princeton in the US. Current projects include a viola concerto for Rivka Golani, an orchestral work for Dame Alice Owen's School and works for two Spanish contemporary music ensembles.

Owen also studied conducting with Diego Masson at Dartington; formerly musical director of the Avon Sinfonia in Bristol, he is the conductor of the long-established Tudor Orchestra in North London.  In 2007, he began to give concerts with his new orchestra, the Helios Chamber Orchestra, which is committed to exploring new and unusual repertoire.