Born in The Netherlands, and later moving to Italy, Germany, Belgium and the UK, Leon started his musical studies playing the violin, trombone and euphonium. He first experienced conducting at the early age of 17 and shortly after began lessons with renowned conductors Jan Cober and Federico Santi. His accomplishments are a testament to his exceptional talent. In March 2018, Leon was honored with the "Jong talent van de maand" award. Subsequent achievements include winning the special jury prize at the International Conducting Competition during the Deutsches Musikfest Osnabrück in 2019, clinching the third prize at the 2021 Conducting Competition "Premio Frederick Fennell," and being bestowed with the 2023 Mortimer Furber Prize for conducting at the Royal Northern College of Music. Notably, he has recently received the prestigious 2023 "Kersjes Fonds Prize."

Leon has recently been appointed Resident Conductor with the Muscat Royal Philharmonic Orchestra, in Oman, where he moved to at the beginning of the 2023/24 season, working closely with the orchestra and its choir, as well as performing in the country's major concert venues. Leon's international portfolio includes collaborations with a diverse array of ensembles and orchestras, such as Manchester Camerata, Northern Ballet, NEW Sinfonia, Chethams Symphony Orchestra, Stockport Symphony Orchestra, Nottingham Philharmonic, Chester Philharmonic, Southwest German Chamber Orchestra, National Youth Orchestra of the Netherlands, Wiener Festspiele Ensemble, Orchestra della Magna Grecia, The Hallè Orchestra, Orchestre Symphonique de Quebec, Orchestre Metropolitain, and more. Noteworthy upcoming debuts include performances with the BBC Philharmonic, PSAPPHA ensemble, and Orkest de Ereprijs. Beyond his role as a conductor, Leon is the founder and artistic director of the Maastricht Academic Chamber Orchestra (MACO) and the Maastricht Winds Orchestra. His academic journey includes invaluable experiences assisting renowned institutions and orchestras such as the BBC Philharmonic, Royal Liverpool Philharmonic Orchestra, Opera North, Chethams Symphony Orchestra, PSAPPHA contemporary ensemble, Asko Schönberg, Orkest de Ereprijs, RKST21, Belgian National Orchestra, the National Youth Orchestras of the Netherlands, and the RNCM Orchestras and Opera, working with conductors such as Joshua Weilerstein, Ben Gernon, Jonathan Bloxham, Omer Meir Wellber, Mark Wigglesworth, Rory Macdonald, Garry Walker, Antony Hermus, Jurjen Hempel, Jac van Steen, Alpesh Chauhan, Dirk Brossé, Eva Ollikainen, Leslie Suganandarajah, Christian Lindberg, Andrew Manze, Clark Rundell and Domingo Hindoyan. His rich and varied experiences contribute to his standing as a dynamic and accomplished conductor on the international stage.

Leon recently graduated with distinction for his MMus in conducting at the renowned Royal Northern College of Music in Manchester (UK) with professors Mark Heron and Clark Rundell.